Oh I forgot to share my story about clench jaws, migraines and grinding.
I went to a chiropractor school (I was a poor college student getting my nutrition degree). My student was wonderful and told me the problem was my posture. He said I could adjust you, but that would only be treating the symptom. Maybe you could get a referral to see a physcial therapist and see if you're problem is related to posture. It helped immensley for me, but....
I also had issues from a bad childhood. Continuing my counseling has helped too.
So now I almost always stand up straight, haven't had a migraine in years and feel much better. I also got a night guard which I should have gotten years ago. But that's the past and I'm protecting my teeth now for the future.
Hope this helps.