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Why did your dentist prescribe a night guard? Have you also been evaluated by your family doctor?
The night guard is a good idea. If it works it helps with the diagnosis and treatment. If it doesn't, you would need to look for other possible causes and solutions. In the meantime, exercise is an excellent idea and swimming is one of the best forms of exercise. You should also ask your doctor about using a muscle relaxer at night to keep the jaws in a more relaxed state.
If you are concerned about hearing loss, get an audiogram. You would want to see the specialist sooner if this is affecting your hearing. As for exercises, regular swimming is best. You could also ask for a referral to physical therapy to design a home program for you.
A normal audiogram is very reassuring. The night guard is worth a try. Three months seems like a reasonable test period.
Yes and yes. :-)
An xray would help to look for possible degenerative changes in the jaws, which could be of both diagnostic and prognostic value. As for stress in the jaws, muscle relaxers can help, as can anxiety medications such as clonazepam. In addition, meditation, yoga, or hypnosis therapy may be helpful and are worth a try.