Problem:
Billy James, a 45-year-old man, presents with a serve headache that woke him the last two nights. Each lasted about one hour, then disappeared. He describes a serve, stabbing, burning pain behind his left eye, accompanied by nasal stuffiness and discharge, and tearing from his left eye. The first night he thought the headache could have been cause by several glasses of wine that he had at a party before he went to bed. Now he is worried, because the headache recurred last night, even though he intentionally avoided alcohol yesterday. He denies any prior history of such headaches, or any family history of headaches. Based only on the information, you initial thought regarding the most likely diagnosis for his headache is: