I can relate to some of this, earlier today I posted some of my story, under the 'My possible solution….' thread.
I have heard there is a nerve that goes down the spine from the head that can cause migraines when stressed, e.g. with whiplash victims.
I had some brainfog develop a few years ago, I started taking saturated fats, which help the brain, my fog is getting better, (I overhauled my diet, and went totally healthy too).
I used to get 'auras' too, if thats what you meant by feeling of seizures. These stopped once i used the tinted glasses, see my original post, to see what i mean.