Eating, when i chew it hurts?

i went to the dentist last month, they said i have a cavity, and that i need to come back apr. 15th, but every time i chew, it hurst not jus on that side, but both sides of my mouth, i have a wigly tooth, but i don't think thats the only reason why it hurts on the other side! (BTW the right side of my mouth has a cavity and a wiggly tooth, the left side only has a wiggly tooth! :D)