Suggest Medication For Sharp Pain On Left Side Of Chin

hi, every now and then, roughly every month, i can yawn, talk or eat, and get a VERY sharp pain in under my chin on the left hand side.. which paraylises me as it is that painful.. this has happened over 2 years... but last couple months its getting worse.why/what is this? Everytime i see my doctor, he seems to think im making it up, or exagerating.