Hello @margesil, I would like to add my welcome to Connect along with @dhamil and others. There is a wealth of member experience with B6 toxicity here on Connect. You might find it helpful to scan through other discussions on B6 toxicity to learn what others have shared. Here's a link that lists the discussions - https://connect.mayoclinic.org/search/discussions/?search=b6%20toxicity.

Here are a few references if you haven't already seen them:
-- NIH - Nutritional Neuropathies (B6 section might answer your question)
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4199287/
-- Vitamin B6 Toxicity Revisited: A Case of Reversible Pyridoxine-associated Neuropathy and Disequilibrium. (P4.021)
https://n.neurology.org/content/90/15_Supplement/P4.021
-- Vitamin B6 Toxicity
https://www.ncbi.nlm.nih.gov/books/NBK554500/