Facial neuralgia or tic doulourex. This is pain of the gasserian ganglion or one or more branches of the trigeminal nerves. It is felt as pain along the side or top of the head, the scalp and around the eyes...a “skin headache”...and sometimes accompanied by facial muscle cramps. It is usually initiated by trigger points, with blood sugar irregularities and substance sensitivities often lowering their threshold of irritation.