I also have idiopathic small fiber peripheral neuropathy diagnosed at Rochester Mayo but I only have numbness with no real pain. I'm not a diabetic but have always been in the pre-diabetic category until the past year or so when I've been working on healthier eating habits and lifestyle changes. One of the things that got me looking into making changes is knowing that I fall into the metabolic syndrome category. Making changes has helped with my condition and I do have some feeling in my feet. If you would like to learn more about metabolic syndrome, here are a few references:

--- A comprehensive definition for metabolic syndrome
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2675814/
--- The Metabolic Syndrome and Neuropathy: Therapeutic Challenges and Opportunities: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3881591/
--- Metabolic syndrome as a risk factor for neurological disorders
https://pubmed.ncbi.nlm.nih.gov/21997383/