It does sound like fairly typical SFN symptoms. Might not be a bad idea to see the neurologist again and indicate that your your dermatologist suspects SFN. (Most of the tests they give you during a routine neuro workup are looking at large fiber issues. Small fiber issues are more difficult to diagnose and also very difficult to pinpoint the cause and to treat.) My case is similar in that my neuro never found specific evidence to prove SFN, and has only diagnosed me with "disturbance of skin sensation".