i've had chronic pain and know the frustration.
I had one nerve block work out of 3, so maybe when he is elgible he try again. pain was gone after the one that worked!. Also since Ive been on my 4 anti-epileptics, my pain has reduced greatly. And I was on cyymbalta, which helped too, but had side-fx for me. Also have opiates, but they just seem to mask the pain, not real relief for chronic. wonder if cannabinoid would help. I've just recently found the real stuff helpful.