Thanks for asking the query,
Discomfort and pain in the jaw can be due to Temporomandibular joint disorders, neurological disorders, if you are having habit of clenching and grinding of teeth, or some infected tooth in the oral cavity can lead to reffered pain in the jaw.
I would suggest you to visit to an Oral and Maxillofacial Surgeon and get a checkup done,
Take an OPG radiograph to look for any abnormalities in TMJ
TMJ disfunction can also leads to pain around ears, tenderness in the jaw,and can lead to difficulty in mouth opening and chewing. Also check for any neurological disorders.
If there is presence of any oral infections like infected tooth get it treated.
Take tab combiflam
500mg for pain relief.
Eat soft diet
, relief stress
Maintain a good oral hygiene
, use antiseptic mouthwash gargles twice daily.
Hope this helps out.