Hey Debbie, you do sound like you're in great hands and if you can avoid that nerve biopsy, do.
According to my neuro, it's the last move if the dx is not able to be determined by other means... my Nerve Conduction Test turned out very similar to yours... my feet went numb and my legs went spastic with the electric shocks... then the partner (a younger cockier neuro) came in to read my test and immediately assumed I was diabetic... my neuro stated, that my results of: nerves are smaller & slower reactions than they should be for a woman my age and size was consistent with my persistent symtoms of numb feet, legs not always working, imbalance, spasms, restless legs etc.. but I don't have any rash of any kind any where.
The bottom line on the biopsy for my neuro was that he prefers to check DEAD nerves to find out why but the Nerve Conduction Test simply pointed out I had greatly reduced sensations and particularly on one side. I have learned all our bodies are very very different iwth this disease and though it mimics many things, and it hides alot, a thorough doctor is an ace to have in your camp! I hope they discover what's going on for you soon.
Fear knocked ~ Faith Answered ~ No one was there! :)
~ Ephesians 6:13 ~ * ~ Psalm 27:1 ~