I have brain fog and also feel like I can feel my brain move when I drive over bumps in the road. I find this is coupled with all my other symptoms.

As you haven't already done it, why don't you try taking a couple of weeks off work and getting as much sensory and cognitive rest as possible?

It helped me but you have to plan it, otherwise you'll end up having an hour with nothing planned and end up re-calculating your finances, or something equally taxing :-)