I just found your post because I was looking into a clinical study for myself, and you have to have the antibody you are mentioning, or another antibody, that is causing Small Fiber Neuropathy. I don't know if that's the disorder you have, but take a look at the study. There may be some helpful info even if that's not what you have (this intravenous treatment they are studying) . Best of Luck.
(It's not letting me post a link, so search for this: "IVIG in the Treatment of Autoimmune Small Fiber Neuropathy With TS-HDS, FGFR-3, or Plexin D1 Antibodies")