It could be related to your sinuses. A persistant earache should be investigated by your doctor to rule out an ear infections. Left untreated ear infections can cause permanent irreversible hearing loss. In the meantime try an over the counter pain med and lay on a heating pad set on low for about 10-15 minutes at a time. DO NOT sleep on a heating pad as serious burns can result even when set on low. In the morning if your ear still hurts get an appointment with your doc to get this checked out.