I don't know what type of pain clinic you are being referred to. If it is the one I am thinking of, they are pretty good.
Unfortunately, they don't have a magic wand to stop all the pains, but they teach you relaxation, gentle exercise, diet, communication, and lots more.
The one I was referred to ran for a 12 weeks with weekly sessions.
If you are still at work, your hand problems may be due to repetition.