It is probably TMJ. Please take action now. See your dentist first to see how bad it is. People with Fibromyalgia grit and grind their teeth, especially in their sleep. Years ago I had a dentist tell me I had very sharp teeth and I wore my mouth guard 24/7 for several months then just at night. Then about 2014 I lost my mouth guard. So many things were going on it was almost 4 years later before I got a new one. Then Covid hit and my Husband s COPD started getting worse. My teeth were affected by me getting the Covid, he never did, so I no longer have really sharp teeth. About 2 years ago I caught myself gritting my teeth during the day. Stress is really bad for Fibromyalgia people and so is our pain. My jaw is now where I may have to have surgery, but as my husbands primary caregiver, I can't take time ( closest TMJ doctor is 1 half hour drive). So when I'm home I wear my mouth guard 24/7.
The reason I'm telling you this is because when you catch TMJ early, it can often be remedied by wearing a fitted mouth guard from your dentist. If not treated you can have all kinds of problems. 🤗

I used to have a jaw issue like that. A chiropractor aligned my jaw. Since then I’ve not had any issues and I have never had a migraine again

After all I went through in high school with braces, as soon as I felt my teeth move I got to an orthodontist. I wear removable retainers at night. It has made a huge difference in my jaw.

Mine catches on the left side, tmj

Sounds like tmj. U should get a mouth guard. God bless!