What is wrong with my filling?

This may be a dumb question, but has she checked the surface to make sure that it is drilled down enough so that your bite is the same as it was before? Sometimes if they don't drill the filling down to the exact form your tooth was in before, you can get referred pain on that whole side of your mouth. Once the problem is fixed, your mouth will still be fairily sensitive for about a week afterwards. This is really a question that you should see your dentist about though, as none of us have a D.D.S. following our name.... haha! Good luck!