What can cause ear aches, difficulty swallowing, stiff sore neck and difficulty opening my mouth?

TMJ vs other problem: Might be TMJ but your symptoms are vague enough that I think an evaluation by a ENT doc is warranted. If negative, see 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.

See TMJ specialist: When your jaw joints are misaligned or not working properly, the resulting popping and locking and discomfort can extend far past your jaw pain. See a dentist or TMJ specialist for examination, diagnosis and treatment.