It sounds a bit like trigeminal neuralgia, and if it is, then no amount of pain killers are going to make it subside completely. There are a few drugs that do work well on this, though they can have other side effects. Tegretol is one. I think you need to go back to a doctor about this one. If you talk about it as "nerve pain" then you might get them to prescribe something more appropriate. Also make sure you tell the doctor that you have checked out dental problems and it isn't that.