My jaw will lock up , it's really painful and stops me from sleeping, what to do?

See your dentist.: You probably have Temporomandibular Joint (TMJ) Syndrome.

TMJ PROBLEMS: This is probably from your temporal mandibular joint also known as your TMJ. It can become inflamed and irritated and cause a snapping or popping sound while chewing. If painful make an appointment to see a dentist or other medical professional that specializes in TMJ treatments.