@dpchip, I don't have the pain with my idiopathic small fiber peripheral neuropathy but do have the numbness and some tingling. There is an older discussion that might be helpful while you wait for others to respond.
-- Vitamin B12 and Neuropathy: https://connect.mayoclinic.org/discussion/vitamin-b12-and-neuropathy/

Here are some references I posted in the discussion above to learn more about Vitamin B12 and other B vitamins in relation to neuropathy.

B Vitamins for Neuropathy and Neuropathic Pain
https://www.omicsonline.org/open-access/b-vitamins-for-neuropathy-and-neuropathic-pain-2376-1318-1000161.php?aid=90896
B6 section it explains -- too much or too little gives neuropathy
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4199287/
FDA Safety Alert: Biotin Can Affect Medical Test Results
http://cle.clinic/2G6Mp4y
NIH - Nutritional Neuropathies
-- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4199287/

Vitamin B6 Toxicity Revisited: A Case of Reversible Pyridoxine-associated Neuropathy and Disequilibrium. (P4.021)
-- http://n.neurology.org/content/90/15_Supplement/P4.021

I take 8000 mcg daily of B12 Methylcobalamin as one of my supplements for neuropathy. I posted my neuropathy story in the Members Neuropathy Journey Stories discussion here - https://connect.mayoclinic.org/comment/310341/.