Thanks for using the forum. I am happy to address your questions, and my answer will be based on the information you provided here. Please make sure you recognize that this forum is for educational purposes only, and it does not substitute for a formal office visit with your doctor.
Without the ability to examine you and obtain a history, I can not tell you what the exact cause of your symptoms is. However I will try to provide you with some useful information.
Your symptoms may be consistent with a disorder called trigeminal neuralgia. The trigeminal nerve (also called cranial nerve 5) is the nerve that supplies innervation to the majority of the face, in addition to having some other functions. A problem with this nerve arises either for no apparent reason (what is termed "idiopathic"), or due to a small vascular ring around the nerve, or in some cases due to demyelinating disease (such as occurs in MS), and less commonly due to a tumor pressing on the nerve. The latter causes can be largely investigated using MRI of the brain with specific sequences, and MRA.
The symptoms include pain in the face, ranging from mild twinges to severe stabbing, shooting pains. They typically occur in the same part of the face and may be triggered by touching the face, brushing the teeth, chewing, or other triggers.
Another name for this disorder is "tic douloureux". This condition is treatable with various medications, some of which are seizure medications (trigeminal neuralgia is not a seizure disorder, it's just that some of the medications used to treat seizures treat the pain of trigeminal neuralgia as well). When these medications are not helpful, other medications can be used, and in some cases, surgical therapies are available as well.
There are a few other causes of facial pain, most of which relate to a problem with the trigeminal nerve.
Evaluation by a neurologist is recommended.
Thank you for this opportunity to answer your questions, I hope you find the information I have provided useful, good luck.