http://neurotalk.psychcentral.com/forum26.html

Trigeminal Neuralgia

sounds very much like TN i am no expert but maybe you might be able to see if its a lot like this

there is also a headache forum here they helped me when i first got TN

I don't recall mine hurting down to the jaw but then again my head hurt so much it very well could been bothering me and i didn't feel it. yesterday here two others described their TN a lot like yours, was not sure if you knew where the TN forum was so threw in the link.

knowing what you are going through i found darkness was my friend ice helped too heck i was wearing my shades in the house at one point

I hope you feel better real soon