AKT-5227

AKT-5227

A 26-year-old man comes in for a check-up. He has been experiencing headaches for the past year. These headaches occur around 5-6 times per month and last all day. There is no associated aura. He describes the headache as a severe throbbing on both sides of his head with nausea and lethargy. He typically goes to bed when he gets a headache as activity makes it worse. He takes one of his father’s diclofenac tablets before bed, which seems to help. Neurological examination is normal. What is the most probable diagnosis?