--but they generally aren't the first things prescribed, as nerve pain is a different entity than nociceptive pain and they don't work for eveybody; anti-epileptics (such as gabapentin, pregabalin, and the like) and antidepressants are usually prescribed initially.

Does sound like you do have some potential causes in the work-up--you said you tested low in B12 (deficiency)? What were the numbers? (B12 deficiency can certainly cause neuropathic symptoms, and should prompt further testing for things like celiac/gluten sensitivity, iron and Vitamin D levels . . .)

Two things--one, make sure you get copies of ALL lab test results (including the nerve conduction studies); you not only want them for your records, but many doctors dismiss pertinent high or low results. Second, I don't know how complete a work-up you've had, but you can compare it to the Liza Jane spreadsheets, which were devised to be as exhaustive a list of possible tests for neuropathic symptoms as we could all come up with:

www.lizajane.org