Thanks for your query, I have gone through your query.
The pain in the jaw can be because of a fractured restoration or fractured tooth.
Consult a oral physician and get it evaluated. If it is a fractured restoration or fractured tooth, if it is involving pulp, then it has to be treated with RCT or extraction. If it is not involving the pulp, then it can be restored with a composite material. Before this procedure, get a radiograph done to rule out whether the fracture is involving dentin or pulp. Based on this we can decide the treatment.
I hope my answer will help you, take care.

Hello,
You may be grinding your teeth causing stress on the TMJ. I mention this because of the chiropractor telling you your neck has some problem. A night guard can be helpful if you grind your teeth at night and offer some relief. Your dentist can evaluate your bite and make a recommendation.
You may have an infection in a tooth that needs treatment. See your dentist for an evaluation and necessary x-ray. If you broke a filling, you also need to take care of that to avoid a larger problem. Broken teeth or filling can also be a result of grinding your teeth.
Maintain good daily dental care which includes brushing, flossing, and rinsing. Look for sensitivity to temperatures and pressure. Take Motrin or Tylenol if you are experiencing discomfort before you can visit your dentist. Plan to make an
appointment soon. Plan to have a physical to rule out heart problems as recommended as well.
Thank you for your inquiry. I hope you feel better soon.