It sounds like it could be a TMJ problem, meaning Temporal Mandibular Joint. When you open and shut your jaw, do you hear clicking? Try putting you finger on the bone just under the ear, open and shut the jaw, does it feel funny, hurt, or make a "cracking" noise. Are you ears plugged of feel full. There are so many TMJ symptoms, I can not begin to list them, but, it sure can cause jaw pain, in fact, it can sometimes even cause upper chest pain. I would see an orthodontist, he will run some tests on the jaw area and be able to tell you more of what is going on.
Oh, do your clench your teeth or when sleeping, been told you grind your teeth? This is also TMJ related and will cause the jaw to hurt.
The hard part about teeth grinding is you never know you're doing it, because you're asleep. I once ground a hole in a feeling and never knew it. My wife will sometimes tell me in the morning that I was making awful noises and wonders how I even have any teeth left the way I can grind them.
As I was reading your post I was thinking like Susie was, either a cavity or TMJ or teeth grinding. Or even severe clenching of the jaw.
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