My right jaw jus under ear hurts since morning when i open my mouth..what it is ..am scared..

Jaw pain: Could be dental throat or ear problem and needs examination. Please see a doctor for examination and then they can make a diagnosis and information and a treatment plan is often reassuring

Infection: It is likely that you may have an infection in your gum or ear and the lymph nodes would possibly be inflamed as well. See a doctor who can examine you and then treat you accordingly

Jaw hurts: Sorry to hear about problem. Could be TMJ problem. Discuss with your Dr and show what makes it hurt.