Our expert says:
You might have strained something - it's not unheard of to damage ligaments or tendons or muscles in the jaw area, though i'm not 100% sure how you would have done that in gym. It could happen just as a result of sleeping badly, and so really could be due to anything, with the gym being entirely co-incidental.
So my advice (given the time that has gone since you sent the question in - my apologies) is to assess it and see what the situation is. If the pain is still there, then absolutely, consider seeing someone. But I suspect it may have come and gone, in which case you no longer have a problem!
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