The sound and visual over-stimulation is the primary cause of your problems. Most with PCS have problems with visual and auditory over-stimulation.

The brain fog is because the brain has fatigued from trying to process the visual and auditory stimuli. This will likely be your most problematic issue.

The ear plugs will reduce the sound by about 30 dB. They will also greatly reduce the background sounds (ambient noise) so you brain does not have to struggle to process the local voices.

Many of us have just learned to put up with the head aches. They do not stop us from going on with life. The brain fog and inability to process information correctly are the PCS symptoms that make life miserable.

I think this derealization you talk about is really your brain becoming overloaded leaving you in a confused state. When your brain fails to process your existence/environment, it can feel like you have lost touch with life. To me, this is just the most severe level of an anxiety attack. It is your brain telling you to remove yourself from the environment and duck for cover.

When you son gets to be a bit older, you may notice him occasionally becoming overwhelmed with a vacant and scared look in his eyes. It is his little brain becoming confused.

Our injured brains can behave just like an immature brain.

My best to you.