MRCP2-3509

A 47-year-old man has been referred to you by the Accident and Emergency doctors due to a severe headache. He reports that the headache woke him up at 3am and it is the most excruciating headache he has ever experienced. He has had two similar episodes over the past three days, each lasting approximately 70 minutes. The pain is concentrated around his left eye and temple and is described as sharp. Upon examination, you notice that his left eye is swollen and watering, and there is some redness and mild bruising above the eye. He admits to hitting his head against the fridge door in an attempt to alleviate the pain. What is your recommended treatment for his headache?