A45-year-old man presents with left-sided headaches. he describes the pain as sharp, almost stabbing in nature. headaches last 30-60 minutes, he rates the pain at 9/10, and he finds it difficult to sit still during the episodes. he notes that, during this time, he also has tearing of his left eye. the headache has been occurring daily for the past 15 days. he had a similar episode occur about 2 months ago, and the headaches resolved spontaneously. what is the best treatment for this pt?