That is a very good question. I am on a quest to find an empathetic doctor that will listen to the facts. I have been tested for everything you can think of. I was very confident that my condition was not vascular, but I had to have muscle and nerve biopsies anyway. Nerve biopsy revealed neuropathy. No kidding! The EMG and nerve conduction revealed more. It is all a crap shoot. It all started with dental work. I took no antibiotics or any other drug other than hydrocodone for pain after the procedure. The dentist put a lot of shots in my mouth before pulling my teeth...all of them at one time!! Maybe an overload of lidocaine straight into the nerves in my mouth. Time will tell. I am still hopeful. I am experiencing new sensations for 3 days now. The periodic nerves jumping throughout my body have recently been feeling more like the "fleas biting and jumping" on my arms ankles and feet. I have been able to bend my toes. Could it be reversing?? Praying it is