cyclelops, what a pickle you are in! Those are complex conditions. What kind of doctor do you have treating you--rheumatologist? I presume what you are saying is that although small-fiber neuropathy may be limited to hands and feet--inability to sweat, BP anomalies, migraines, cold extremities, etc. reflect a more systemic dysfunction? Occasionally at night I'll have a sweat so I know I am capable.

BTW, I tried soaking my feet in epsom salts, and it may have been a coincidence, but, I was up until 0400 with worse pain. It felt good at the time though and I will try it again. I take magnesium supplements regularly.