Todd Levine MD. Well worth watching for PN;
https://www.youtube.com/watch?v=pcdKhKSLca8
*Narcotics are discussed near the end.
Small Fiber;
https://www.youtube.com/watch?v=6FidaYDO4YI
*Near the end of the video he discusses IVIG and how it can regrow the nerves in some cases.
Cliffman