Crushed cloves, they don't taste great, they'll probably make you drool, but they DO numb the area. I'd stuff crushed clove all over there, let it sit for a minute and gently rinse with warm salt water. You'll need to be seen by a dentist still, and it won't fix the problem, but it does provide temporary relief.
Also an ice pack on the outside can help a little bit to sometimes.
Get to the dentist. You can cover the pain but clearly there is a problem that won't go away without the knowledge of a good dentist. In the mean while take two Motrin while your waiting to get to your dentist.