I'm having pain in left carotid jaw or ear. could this be tmj?

Could be: Would need a thorough history and examination to really answer your question. Need to ask about severity, duration, triggers, trauma history, and other important related symptoms. I would see a dentist and possibly a tmd/tmj specialist asap.

Posssibly: You need to see a dentist who has had training in treating tmj.

Yes: Yes. Could be TMj or other nearby problems. I'd see an ENT doc and a TMJ specialist. Any dentist can be a TMJ expert with the proper training and experience. Most commonly, oral surgeons, prosthodontists, and orofacial pain specialists. Ask your MD, your dentist and your dental society for referrals.