First of all, keep in mind that I am unable to diagnose you because I am unable to examine you, this forum is for educational purposes.
The symptoms that you describe are not consistent with any single disorder. However, some of the symptoms that you describe are found in a condition called trigeminal neuralgia. This condition is very painful, and is triggered by areas of the face and mouth. This condition is caused by irritation of the trigeminal nerve and can be treated with tegretol and other medications. In some refractory cases surgery or gamma knife is used to desensitize the trigeminal nerve. I would suggest that you see a headache/pain specialist for further evaluation.
I hope this has been helpful.
you should have an ear-nose-throat (ENT) doctor look inside your nose with a small telescope. YOu may have a small polyp that may not be visible on an MRI.