Great question. The more I read about SPS, the more I think that might be the “undiagnosed autoimmune disorder” that I wrestle with; alone with osteoarthritis. I’ve actually seem 5 different neurologists, though, and other than confirming I have peripheral neuropathy, they’ve been no help. I believe two of the neuros specialize in autoimmune disorders. So I’ve basically stopped chasing the neurological side and continued seeing my rheumatologist.