@plbelanger, my experience with idiopathic SFPN and early stages of LFPN tells me that most neurologists are not terribly concerned
about the origin or cause of the neuropathy. Its been about 10 yrs for me and yes the pain and discomfort has gotten worse. I did well with Lyrica 150mg 2 x a day but even this dose had to be increased over the years. I also had surgery for spinal stenosis but it did not make the neuropathy pain and better but it did help the radicular pain i was having in my left leg. Perhaps for now focus on what works to make your neuropathy more tolerable. September will be here soon enough and most likely there will not be any further answers to a cause for your neuropathy. Best, David