I have TMJ caused by 40 years of grinding. Finally, the cartilage on one side slipped out of place so the jaw locked shut. In part, years of going to dentists and having them make my mouth splint (improperly it turned out) made the problem worse. (Physical therapy did not help in my case.) You should see a TMJ specialist. In general, surgery is not performed as often as it use to be (artificial joints for TMJ proved to be a disaster for those who tried it); it might work, but you might need to simply get a good splint made by a specialist, physical therapy might help, you might need braces or you might need occlusion equilibrium. All these treatments can be expensive and insurance may not pay too much. The TMJ doc will do a cat scan to see exactly what is causing the problem - it could be arthritis, it could be a bone, cartilage, it could be the bite or perhaps it is muscular. You might try a dental school if you can't find a doc. From everything I have learned, if this is caught early, it is manageable; don't wait like I did. It is even worse if you have "soft" teeth. Untreated, not only will the TMJ get worse, but you will find your teeth will start to crack and you will need crowns.