I would second Debi's suggestion to find a good podiatrist. Mine was very instrumental in getting me to a neurologist and getting me properly diagnosed. They see a lot of SFN and are more compassionate than many neurologists.

In my experience once a neurologist knows you have SFN they wash their hands of you as there is no treatment but the diagnosis does usually put you on the fast track for pain management as next to trigeminal neuralgia it is one of the worst pain syndromes.

They are the only specialist I see anymore as they also prescribe braces.