Hi. From what I know, there is peripheral SFN and autonomic SFN. I would assume it may be autonomic SFN you might have. I was misdiagnosed for over a year. Going from one neurologist to another, along with many other medical specialists.
There is a brilliant neurologist in NYC that finally diagnosed me and did all necessary testing, including skin and nerve biopsies, EMG/NCV and mri, blood tests , and had my diagnosis within a week. He wrote a book called “ the autoimmune brain”. His name is Dr. David S Younger. He thinks “ outside the box”, is kind, compassionate and brilliant. Perhaps this will be helpful to you and others.