This might sound scary, but try holding ice cold water in your mouth. I had an infected tooth and that made it feel SOOOO much better until I could get it fixed.
May or may not help your situation, but if it hurts as bad as mine did, you're probably willing to try anything.
I had an abscess under a tooth many years ago, and the only thing that helped the pain was to chew ice and pack the resulting slush in between the gums and cheek where that tooth was.
It wouldn’t do anything for a minute, then suddenly the pain would just turn off. It was great.