TMJ can flare up at any time. It's a good idea to keep a journal of what you do and eat during the day, that way when the pain starts you may be able to see what triggers it.
Anti-depressants are for pain management. If the muscles in your face are so wound up that they're causing you so much pain, you'll need to be patient while you work to relax them.
I'm not sure whether TMJ can be cured, but it can be managed, you just need to work out what steps are right for you.
I've been on anti-depressants since November; itially, I felt so much better, but it's all heading down hill again.
It's very frustrating being told that TMJ is caused by stress, because it increases that stress dramatically. Basically, the list of things you're doing sound good, but you need to give it time. Also, have you restricted your diet to mostly soft food? This helps give your jaw a break.
Which anti-depressants are you on, by the way?
Good luck
Melanie.