It definitely does sound as if nothing is resolved. What matters a lot, I think, is if your problem causing you pain is a transient issue that you can expect to have completely resolved at some point in the near future, or is due to a chronic problem that you will have to manage over an extended period of time. If it is the latter, then the problem sounds much more serious. In either case, it sounds like your boyfriend has selfish streak. If your problem is long term, he may feel like he is never going to feel secure that you are sexually available to him, since on any given day, you might or might not be dealing with pain.

It might be helpful for you and your boyfriend to go together to meet with your doctor. Your boyfriend may be wondering if this condition can really be causing you enough pain to make enjoyable sex impossible for you. It would be best, if he could just take your word for it. But he doesn't sound like he does.

This must be very hurtful for you. After 2 years, you'ld hope for more understanding. You mentioned that the problem started over loss of self-esteem connected to weight gain. How that ties in with a pain issue sounds confusing to me, and your boyfriend may be genuinely confused, too.