I had RNY 2 years ago and have started having some neurological problems too.
Not being able to squeeze jars. Dragging feet etc.
I joined to reply to you because ALS of course has been on my mind.
I found a blog of a lady from Maine who had the sleeve and then was diagnosed with ALS a year perhaps 2 years after? I should note she does not feel her sleeve has anything to do with her diagnosis.
I didn't join her page because I don't want to panic myself yet but I believe it was called Tamurais adventure on Facebook.
Good luck on your search for info.