In reply to smithers25:
Operating sounds a bit extreme without some more investigation, especially if it's not even clear whether it's a joint or tendon problem. Have you had any further tests, X-ray, MRI etc?
Also, and depending on where you stand on "alternative" therapies, might be worth considering something like acupuncture. I've had an ongoing wrist (tendon) problem for a few years now, and at one point was told there's not much to be done and I should just give up climbing (!!!) But following some good physio, deep tissue work and, most recently, acupuncture it's improved hugely and I'm loving being able to climb again. It'll probably never be perfect but if I can climb pain-free then I'm happy!
Whatever happens, hope you manage to get it sorted soon.