How to Get Rid of Brain Fog — The Nervous System Explanation Nobody Has Given You

Brain fog is one of those things that is incredibly difficult to explain to someone who has never experienced it. It is not just feeling a bit tired or a little distracted. It is a pervasive, relentless haziness that can make even the simplest tasks feel monumental.

Forgetting words mid-sentence. Struggling to follow a conversation, to hold on to what has just been said, form your own thought, and respond, a process that normally happens in a microsecond but suddenly feels like trying to juggle while walking a tightrope. Even something as simple as calculating 3 x 4 can suddenly feel impossible to get there, causing a flush of embarrassment that only adds to the distress. And something as ordinary as making a cup of tea can require conscious effort, mentally walking through every single step, kettle, water, cup, teabag, because nothing feels automatic any more. Tasks that once happened effortlessly now require deliberate thought and planning, and that is exhausting in a way that is very hard to put into words.

For many people, the most frightening part is not knowing why it is happening. There is no obvious cause, no diagnosis that fully explains it, and no clear end in sight. Many of my clients tell me they worry it is permanent. That this foggy, dulled version of themselves is simply who they are now. I want to reassure you: it is not. Brain fog is not a life sentence, and it is not random. There is a very real reason it happens, and once you understand it, the path forward becomes much clearer.

I understand this not just as a therapist, but personally. A sudden illness left me experiencing brain fog firsthand. Nobody could explain why it was happening or whether it would ever go. That uncertainty is, in many ways, the hardest part. It is also a big part of what drives my passion for helping clients who are going through the same thing — because you deserve an explanation, and you deserve to know that there is a way through.

How stress and the survival response cause brain fog

Deep within your brain sits a small, almond-shaped structure called the amygdala. Its sole job is to keep you alive, and it does this by continuously scanning for danger. The moment it detects a threat, real or perceived, it fires off your survival response. Your body has two well known options. Fight, where it prepares you to confront the threat, or flight, where it prepares you to run from it. Either way, your heart rate increases, your muscles prepare for action, and your body floods with adrenaline and cortisol. This is the wired, on-edge feeling most people recognise as anxiety, that heightened alertness and sense that something is wrong.

But there is a third survival response that is far less talked about, and it is the one most relevant to brain fog. When the nervous system perceives that neither fighting nor fleeing is possible, that the threat is simply too much or has gone on too long, it can move into a state of shutdown. Heart rate slows, energy drops, and the whole system powers down to conserve resources. This is known as the freeze response. It does not feel like anxiety. It feels like flatness, numbness, exhaustion, and disconnection. A fog that no amount of sleep or willpower seems to shift. From the outside, a person in freeze can look perfectly fine. On the inside, they are running on the most minimal reserves their nervous system can manage.

The problem is, your brain cannot always tell the difference between a looming deadline and a lion. And critically, it does not automatically know when the danger is over.

How fight, flight and freeze affect cognitive function

When the survival response kicks in, whether that is fight, flight, or freeze, your brain prioritises survival above everything else. Resources are redirected away from the prefrontal cortex, what I like to call the logical brain, the part of your brain responsible for logical thinking, decision-making, planning, and memory. In an acute stress response, engagement with this part of the brain can drop dramatically.

Think of the logical brain as the wise, clear-headed part of you, the one that weighs up options, remembers what you were doing, and keeps you calm and focused. The survival brain, by contrast, operates largely from the subconscious, automatically and instantly, beneath the level of your awareness. When the survival brain takes over, the logical brain goes quiet.

This is why brain fog can feel so bewildering. Your conscious mind knows perfectly well that you are safe, that there is nothing to worry about, that you simply need to make a cup of tea or answer an email. But beneath the surface, the subconscious survival brain is running an entirely different programme, and it is not listening.

It is not a character flaw. It is neurochemistry.

Why brain fog persists after stress, illness, or trauma

Brain fog does not only occur during times of active stress. Many of my clients come to me having already moved through a difficult chapter. Whether that is a viral illness such as COVID or another infection, a bereavement, a relationship breakdown, burnout, or a prolonged period of pressure, it is behind them. Their life, on paper, looks and feels manageable again. And yet the fog remains.

This is because the subconscious mind can get stuck. It learned, during that difficult period, that the world was unsafe and that it needed to stay on high alert. And without a clear signal that things have changed, it keeps running that same programme, long after the original stress has gone. The survival brain continues to take over, the logical brain continues to go quiet, and the fog persists, not because anything is currently wrong, but because the subconscious has not yet been shown that it is safe to stand down.

Why brain fog becomes a self-reinforcing cycle

There is also a self-reinforcing quality to this. The more foggy and forgetful you feel, the more frustrated and worried you become about it. That worry is interpreted by the subconscious as further evidence that something is wrong, which keeps the survival brain activated, which keeps the logical brain offline. Round and round it goes.

Many people also begin to worry that something is seriously medically wrong with them, which adds yet another layer of perceived threat and deepens the fog further.

How hypnotherapy, NLP & PSYCH-K can help brain fog

The nervous system is not set in stone. It is adaptable, and it can be retrained. The logical brain can come back online. The fog can lift. But to achieve that, we need to work at the level where the pattern is being held, which is the subconscious mind.

This is precisely where hypnotherapy, NLP, and PSYCH-K can make a real and lasting difference.

Hypnotherapy guides the brain into a deeply calm and regulated state, one where the survival brain is no longer on high alert and the nervous system can begin to feel genuinely safe. In this relaxed state, it becomes possible to gently work with the subconscious, helping it learn that it no longer needs to run the old danger programme.

NLP works with the internal patterns of thought and perception that keep the cycle running, helping to interrupt habitual stress responses and replace them with new, more resourceful ones.

PSYCH-K works at the level of subconscious belief, addressing the deeper programmes that may be sustaining the danger signal long after the original stress has passed. Beliefs like “I am not safe,” “I have to stay alert,” or “Something bad is about to happen” can sit quietly beneath the surface, driving the nervous system without your conscious awareness.

Natural ways to support nervous system recovery

Alongside deeper therapeutic work, certain daily practices help signal safety to the nervous system. Slow, intentional breathing is one of the quickest ways to shift the body out of survival mode and into rest and recovery. Gentle movement, particularly in nature, helps discharge residual stress hormones and supports healthy blood flow to the brain. Consistent, quality sleep gives the brain essential space to regulate and restore. Reducing stimulants like caffeine, which can mimic and amplify the stress response, is also worth considering.

Some of my clients also find it helpful to support their vagus nerve directly. The vagus nerve is the main pathway through which the nervous system receives the signal that it is safe to stand down, shifting the body out of survival mode and into rest and recovery. There are now small, non-invasive devices available that are designed to stimulate and tone the vagus nerve, and used regularly, they can be a valuable complement to therapeutic work. If you would like to know more about this, please do get in touch.

Most importantly, if your brain still feels foggy even though the difficult period is over, please know that this is not a sign that you are broken or that something is permanently wrong. Your subconscious has been protecting you, using the best information it had. It simply needs to update what it believes so that it is accurate and helpful.

Free 20 Minute Discovery Call

If this resonates with you, I would love to help. The first step is a free 20 minute discovery call, where we can have an informal chat about what you are experiencing and how I may be able to help. No pressure, no commitment, just a conversation.

If you have brain fog, the last thing you need is complicated forms and booking systems. Simply drop me an email or give me a call, and we can take it from there.

contact@samanthagrant.co.uk | 07919 577512

I work with clients in Marlow, Caversham, and Reading, as well as online. I look forward to hearing from you.