Tom,
I've been struggling with neuropathy for 2 years now and they don't have a clue to what is causing. I went to Johns Hopkins in Jan of this year and they did MRIs, EMGs, more blood work than is reasonable, 13 vials of blood - I asked the nurse drawing the blood if she was going to leave me with any, & a skin biopsy. All normal. I was told all that can be done is to treat symptoms. I've been on 4 different meds and they work for a while and then it gets worse. I'm going to the JH pain treatment center the end of Sept to see what they can do. I share my experience just to let you know that I understand and share your frustration.