I have SFN, confirmed by biopsy. Pain used to be my biggest issue. Lately I have developed some of the symptoms you describe - light headed, dizzy, tinnitus. It’s been pretty debilitating, and unexpected. I rely on excellent physical therapy help, and lots of communication with my medical team. My PT is working to relieve tension in my shoulders, neck and jaw. I have MRI of the brain and c-spine scheduled. I’ve been dealing with this daily for 4 months, and am ready for a change!