What do i do about severe jaw pain, swollen gland on same side?

Call dentist: Pain ; swelling = problem that your gland is swollen too indicates the infection is draining and spreading. The sooner you call the sooner you will feel better.

See a dentist ASAP: Often it is difficult to determine a single cause, but contributing factors may be: gum infection, TMJ or a dental abscess. You can take NSAIDs or Tylenol (acetaminophen) OTC, but dental exam and treatment is still needed. See your dentist ASAP.