I'd like to interject here also... the presence of rash, and autoimmune could also point to gluten intolerance.

People with gluten issues, may be called Celiac if they have the genetic markers, but also can be missing those, and just intolerant to gluten.

Thyroid disease is linked to it.
Please look at this website, which explains all the confusing symptoms of gluten intolerance (including neuropathy)

http://sites.google.com/site/jccglutenfree/

Over the past decade I have seen many people benefit from that website. So do take a look and study it. She also goes into the complex world of testing for it, where doctors may drop the ball... so that part is interesting, too. Jcc and I met many years ago on a peripheral neuropathy forum, and she has been tireless in bringing this information to people who are suffering from "something" and falling thru the medical diagnostic cracks.