My left ear, the left side of my throat, and the back-lower gums in the left side of my mouth all hurt, especially when swallowing. what do i do?

Ear and throat hurt: You may have a bacterial or a viral infection.In any case you should see your doctor as you may or may not need antibiotics, depending what is causing it.

See DDS and MD: Could be your wisdom tooth, could be something else. You need to be physically examined for a diagnosis.

Many things: It could be a number of things. Infected wisdom tooth, strep throat, canker cores, or primary herpatic gingivostomatitis come to mind.