Review Question - QID 213722

A 27-year-old male medical student presents to student health with concerns about headaches. The patient reports that since starting medical school, he has started developing headaches, occurring approximately once or twice a month. The patient previously has never had headaches and is otherwise healthy. The headaches are especially notable late at night when the patient stays up late. The patient reports that the headaches are predominantly feelings of tightness over his occipital scalp and neck. A year ago, the patient presented to the emergency department for the same symptoms, and a CT performed at the time was unremarkable. The patient is particularly concerned about a brain tumor causing his symptoms, as his family friend was diagnosed with one the previous year. The patient is requesting another scan to rule out intracranial pathology, as he worries about this on a daily basis. Which of the following is the most likely disorder?