Thank you to everyone for the replies, much appreciated!
Speaking of the big trip to the neurologist:
Here is the page I will be showing him. Is this good, or is there anything else I need to add?
(I'm thinking I shouldn't even bother telling him my exact supplement regimen, that changes just about every week. I stop taking stuff because I run out of it, plus I experiment with new things.)
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symptoms
"brain fog" that makes forming thoughts an uphill battle
decreased awareness of surroundings
shocking cognitive decline
memory loss
muscle rigidity
drooling
dizziness
"heavy" feeling
loss of balance
ringing in ears
blurry/distorted vision
pain in hands and feet
nasal voice
quiet voice
nausea
respiratory depression
(symptoms flare up periodically, and are exascerbated by exercise or hot showers)
bloodwork requests
beriberi?
liver pathways? (2 doctors I spoke to suspect this mess is MCS-related)
alpha 1 antitrypsin?
I have most of these symptoms. I have been concentration on the brain but now I am thinking it could be due to liver / stomach issue. Thanks to Mr Happy for pointing me in this direction.