Back of tongue is sore, I pull it to the side and feel pain. Feels like my gum is sore and pain to left jaw, started a day ago.

See a dentist ASAP. for evaluation, oral pathology screening, x-rays and treatment options.
See a dentist! There could be many causes and merely listing some possibilities will not be helpful. Please see a dentist for an evaluation.
May be. May be as simple as a sore throat. If pain persists beyond a few days check in with your Physician.
Vague- many reasons? Hard to determine without a thorough history, exam and possibly some tests. See a dentist or preferably an oral surgeon.