The deep tissue ultrasound really helps, because the muscle around that area is in such a tight spasm and this really helps relax it...also electrical stim at the chiropractor helps, too.
I first started treating it with an orthodontist who put braces on me (I had already had tehm in 8th gradem but this was strictly for the jaw the 2nd time) Honestly I don't think that really helped. He then wanted to break my jaw and "fix" it. At the point when he mentioned surgery, it was finally starting to feel a little better, so I couldn't imagine going through all that when it was starting to get better.
Yes, a "splint"! I forgot that is what they called it. I also wore mine almost all the time day and night. That also helped because my bite was so "off".
I don't have any trouble anymore (and I never had the surgery). Once I got to the chiropractor, it took several more months before it was no longer a problem. At the beginning of all my trouble, I couldn't open my mouth far enough to fit a spoon in, so I definitely lost some weight, but it was a miserable way to do it.
Good luck, I hope your chiropractor can help you.