Thanks for asking the query,
After reading your clinical history i suspect that you might had developed severe infection in the tooth
Pain in the jaw, neck, headache are due to dental reasons (radiating pain
I would suggest you to visit the Dentist
and get the checkup done take an x-rays of the tooth.
Depending upon the x-ray the treatment will be root canal treatment
or extraction of the tooth.
Start with the course of antibiotics and analgesics.
Maintain a good oral hygiene
use antiseptic mouthwash rinses twice daily.
Hope this helps out.