I had this before i got diagnosed w fibro. Saw lots of doctors none of them could tell me what was the cause of it. It hasn't happened in at least a year. Eventually, it went away by it self. I really think it happened when I was feeling stress so I would close my eyes and just try to breathe. Even when I start to get stress or nervous now my voice starts to break and my jaw locks really wired. I hope this helps.

I would definately get this checked out by your doctor and not let it continue for too long there are several things thart could cause this. Good luck