Have they done an MRI. My sister went through something similar (numbing and tingling) . She fell during a slip and fall damaging her discs. She went to the ER complaining about her neck and back and numbness and tingling in her arm all the way down to her fingers, they gave her an x-ray of her arm and back and sent her home saying your not getting any drugs from us. When her arm wouldn't get any better we made her go back to the ER and she demanded an MRI the nurses were nasty to her treated her like a drug addict. After the MRI they admitted her, and the doctor came out saying the MRI showed that her nerve had been pinched between her discs and that is what the problem was, it did not show up on an x-ray. They had to do surgery immediately as it had been pinched for well over 24 hours and if they didn't fix it , it could cause permanent problems.
They had to release the nerve and fuse it with some type of metal (choice between that or hip bone).
So I was just thinking it sounded similar like it might be maybe a pinched nerve, maybe not as severe as what my sister had but it might be worth getting a MRI just to be sure. I really hope everything works out for you, and hope they can treat your pain effectively. Thank you for sharing and please keep us informed as to how it turns out, it's nice to hear how things work out. I really hope they can work thing out for you.