Hi Patty, I think you need to get clear and I'm curious also as to what it means for you when you say you have TMJ. When someone says they have TMJ, they usually mean they have TMJD - temporomandibular joint dysfunction. The key question I think is if you had no pain, would you still consider yourself to have dysfunction?
I say that because plenty of people clench their jaw under stress (I looked up the most common place to clench under stress, the answer was jaw) - stress shows up in many other parts of our body too as tension, including the pelvic floor and shoulders (there's nothing wrong with this, it's normal). Many people's jaw also clicks (we have an example on this forum with Cactusflower, but there's no pain there). Both of these are common, but they often don't lead to pain.
If you would still consider your jaw to be dysfunctional even if you had no pain, then my argument kind of falls apart, but if you wouldn't (and you're only really saying it's dysfunction because it is supposedly leading to pain), then you don't really have TMJ or TMJD because those incidental findings aren't the cause of the pain (they are normal and aren't representative of dysfunction). By saying to yourself that you have TMJ, you're naming the cause of your pain, and no wonder you're terrified. if I was consistently telling myself that I had pelvic floor dysfunction (which I did tell myself for a while, and no surprise I didn't get that far during that time), but if I kept running that programming in my head, I never would have recovered because I never would have lowered the fear enough to react better to symptoms and to expand my activity (which ultimately leads to recovery, but that's very hard to do if you keep reinforcing to yourself that something is wrong with your body).
If you genuinely believe it is TMS and the evidence is there, I would drop the TMJ label completely (medical labels never help). You don't have TMJ, instead you have TMS manifesting as pain in the jaw. Just like I had TMS manifesting as pain in the pelvis (not pelvic floor dysfunction or pudendal neuralgia)