I am not a Doctor, but I would say that suffering two years in pain is enough. I would go back to the Doctor and tell her or him that you are in pain and would like to try something else. I gather you have only had one, so there are a lot of other things still available to try. Also, there are alternatives to the Cox 2 drugs that you may find more wallet freindly. Unfortunately, what you are experiencing is quite common.
Many people have to try numerous approaches until they find one that works.
Others have to get second or even third opinions until they find a Doctor who can help them. Hang in there and keep trying. Also RISG has an e-mail service that is very active. It has approximately 500 members and there is no charge.