You said that your B12 is low. That should be addressed.
From National Library of Medicine:

"Nerve conduction studies on patients with confirmed vitamin B12-associated peripheral neuropathy have demonstrated severe impairment of sensory nerve conduction reflecting demyelinating disorder. Studies suggest that lack of vitamin B12 may lead to primary sensory demyelinating neuropathy"
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8858590/.