How can i tell if its tmj or sinus or dental. had pulp filling 2wks ago. jaw, ear,headache,neck pain. dentist said wait. upper and bottom teeth hurt?

Multiple symptoms: You can't evaluate the cause of your symptoms on your own. We would need more information in order to better answer your question. If you trust your dentist, follow his\her advice. If not, see another dentist for a second opinion.

See OFP specialist: Orofacial pain specialists are experts in TMJ disorders. They are trained two years longer than a general dentist in CODA approved universities (e.g. UCLA, USC, etc) and you will be getting the most accurate diagnosis and conservative treatment. Rec.: schedule an appointment ASAP to prevent future complications. Here is the link for more information: http://www.aaop.org/

TMJ-OFP expert: See a TMJ orofacial pain specialist. Cant tell without a complete examination. Could be any of the things you mentioned.