It does seem to have a complicated situation on your hands--and you're right, heavy metal poisoning can lead to a host of both central and peripheral nervous system symptoms; it's proving the link that's the problem.

I'm not an expert on this, but you might want to try copying your post over to both the Myasthenia Gravis and ALS forums:

http://neurotalk.psychcentral.com/forum77.html

http://neurotalk.psychcentral.com/fo...sprune=-1&f=34

--to see if any of those empathetic people might have some insight into the situation.