For TMJ try the drug buspar. It is the only thing that relieved me of that agonizing pain. 10 MG 2 x daily. it might even make it worse for a bit, but after 2 weeks, your jaw will feel so calm you won't even believe it.Take Ibuprofen for the two weeks until it kicks in
Also, if you don't want to go that route, look into the herb Rhodiola Rosea. This along with buspar are the only things that 'cured' (yes cured) my bruxism. Possibly because of Rhodiola's MAOI effect. Be warned though, people build tolerance to rhodiola rosea quickly, so it just might be a stepping stone to buspar.
And look in dry mouth. i found taking biotene before bed lubricated my mouth and I ground less.