About a week ago, I started getting unbearable pain underneath my teeth (the right bottom side), and my tongue became all white, with one patch near the place of the pain that was still red, and had a white line in the middle. the doctor said it was a viral infection and prescribed me an antiviral, but the colors are still the same (it's my third day taking the antiviral) and the pain is still the same. I'm very concerned! Can it be something else?