WRT reduced sensation and sweating: you may want to find a neurologist who deals with dysautonomia, and maybe get autonomic function testing done. Also look into small fiber neuropathy. There are support groups for these on FB and the like that may have useful information or referrals to good doctors. A lot of doctors hear small fiber neuropathy and only think diabetes. But it’s frequently associated with dysautonomia, progressive and autoimmune/inflammatory in origin.