have you ever done exercised for your tmj.  i found a doctor years ago that got rid of mine mainly by exercising.  it is kind of hard for me to explain it. but take an open your mouth/ with your palm of your hand put on your chin and resist both with your palm of hand and your mouth ... try to keep your mouth open but try to close it with your palm. do not over do this and do not  push so hard that it hurts...just do it a little at a time. once or so a day to begin with then a couple times a day or a tiny bit any time you feel like it.  the pressure release might help your migranes also.  i am not a doctor but have been in chronic pain for 6 or 7 years and at one time this was one of my problems. can not hurt you to try it. it did help me.