I'm sorry you're in so much pain. I used to have terrible headaches everyday, not knowing they were caused by TMJ. After undergoing splint treatment from several dentists, I finally found one that knew what he was doing. Once again, I wore a splint and then braces on my teeth for 16 months to correct an anterior open bite. I still wear a splint when I sleep and also go to Acupuncture once a week. Have you tried that yet? It's been like a miracle for me. I also take Flexeril, a muscle relaxer. It sounds like you've tried almost every treatment. I hope you find something that gets rid of your headaches again.