Countrygirl-
I have TMJ, and have been through hell trying to get someone to help me deal with the complications of it. From $5000 "bite-guards" to chiroprators, pain management specialists, the works.
I also am a clencher. After all the money we've spent through the years, you know what works for me? A 99 cent boil-n-bite mouth guard. You know, like the one you would get in the sporting goods section for your kids to play football? You stick it in boiling water for a few seconds, let it cool a few seconds, then bite it. It conforms to your mouth.
I don't have as much trouble as I used to, but when it flares up, like during stressful times, I just make sure I pop it in before I go to sleep.
Might not work for you at all, but it sure made a difference with my TMJ. Good luck!
Jess