This is not in your ulnar nerve, this is in your mid back. BBB is right, you need to see a specialist ASAP. If you have the right insurance I'd cut the bullshit and see a neurosurgeon. If you have to get a referral then do it; this is not going away.
Depending on the type of damage you may or may not need surgery. If surgery cannot help you, that is actually a worse situation as you will are relegated to a life time of pain management.
BBB knows what he's talking about, don't fuck around. Waiting as long as you have already has already eliminated potential treatments already.
BBB is a specialist, I am just a victim of a similar fate.