it sounds like a condition called trigeminal neuralgia
.it is a very very painful condition .there are some tablets which will give relief.if that doesnt come down then you have options like alcohol injections- or go in for a surgery .essentially the aim of the many surgery procedures is to either damage or destroy the part of the trigeminal nerve
that's the source of your pain.: so it can cause numbness
of the area of nerve supply to a varying degree- as this nerve is the responsible for
most of facial sensation.