CS, you may want to try and look up jaw massage, it can be done both inside and outside of your mouth on the masseter muscle; I think there are videos on it if you google. I had one particular spot that I could get my thumb on and really work at that hurt so bad that is now pain free, I guess there was a knot in there. I was also clinching my teeth all day every day so I had to learn the resting position of the jaw and I constantly police myself to make sure I'm not clinching.
I do heat to the side of my face for 1 minute, massage inside and out for about 30 seconds then ice for 30 seconds and repeat 3 times total.
I hope you're able to get some relief.