Believe me, I empathize--when I was suffering through the most acute stage of my body-wide burning peripheral small-fiber neuropathy, I went through hundreds of tests and the only thing that showed up as abnormal was the skin biopsy, indicating significant reduction in intraepidermal nerve fiber density.

You should come on over to the peripheral neuropathy section here--lots of discussion, advice, and very knowledgeable people:

http://neurotalk.psychcentral.com/forum20.html