TMJ?

I went to the gym after work and had the shortest workout ever. Immediately after the set of squats with 275 pounds my jaw felt really strained. After a few half-hearted leg presses I realized I had a splitting headache and I decided to go home. I’ve used this amount of weight on squats before, so I think my jaw must be really tired from grinding my teeth during sleep. A long time ago I thought I had a cavity and the dentist told me it was just TMJ due to stress. It’s been a stressful few weeks, to be sure.