i was diagnosed w/ fibromyalgia a little over a yr ago and jaw pain is one of my symptoms. if the doctors cnt find anything wrong i would look into that. i also get random sharp pains in my ears. im guessing its probably a muscle spasm. looking into that myself. my jaw gets real tight and hurts really bad, i usually try stretching it open and finding ways to try and relax it. there are other symptoms too like migraines. like i said i would look into it b/c its an invisible disease that docs usually overlook. real hard to diagnose