Sorry to hear about your pain, it must be severe. Have you ever heard it called Reflex Sympathetic Dystrophy? I know that kind of burning pain is awful.
As far as getting some relief, have you tried to see if B12 will help? If not, pick up some Methylcobalamin B12. The type is very important. The most common form is Cyanocobalamin and is not easily absorbed. The methyl is over-the-counter, but harder to find. Try a few tablets and you'll know within an hour if they help. It'll do no harm to try.
If it does, then start looking for the cause.

KYIMP