Hi Sandy,
I also have SFN with no found cause. It started about 2 years ago with autonomic symptoms and then a year ago it progressed to nerve pain shooting throughout my body, buzzing, numbness.... Too much to write, you can look back at all of our old posts to see more details for all of us. There are many of us here with neuropathy that can't be figured out and who are struggling to cope with it. There is so much great advice here and people who have years of research under their belts. Some people here know as much or more than most of the doctors I've been too.