When you do get to a dentist, ask him if it looks like to grit your teeth while you sleep. Not grind, "grit" which is essentially just biting down as hard as you can.
I did that for years and my jaw would ACHE like mad when I woke up. Dentist made me a small implant I wear when I sleep and now I don't do it. The implant wasn't cheap but it does work. Actually, I can't sleep without it now and my jaw no longer hurts.