You have hereditary small fiber PN? Isnt hereditary a cause? Or contributing to a cause if something such as toxins triggers your potential PN? Was genetic testing done? If you know it is hereditary , if it was me id be concentrating on pain relief and trying to give my body what it needs to heal. That is what i am trying to do, with an offical ideopathic cause, though im sure its toxins. Unless it is something like PN caused by diabetes, lyme, cancer etc, then in my opinion it doesnt really matter what the cause is because it is treated the same anyway.