Sharp, "nervy" pain that comes and goes suddenly can be from the trigeminal nerve - the condition is called trigeminal neuralgia. This nerve affects sensations in the side of the face and jaw, and some of the muscles involved with chewing. It has three branches; the upper one might be involved with pain around the temple or eye.
There are several theories and probable causes for the neuralgia. It is not well understood and can be difficult to treat. I have seen some good results with acupuncture, especially auriculotherapy - the treatment of acupuncture points located on the ear. Chiropractic adjustments can also be helpful.
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