Review Question - QID 213541

A 23-year-old man presents to the emergency department with a severe headache. The patient states he gets sudden, severe pain over his face whenever anything touches it, including shaving or putting lotion on his skin. He describes the pain as electric and states it is only exacerbated by touch. He is currently pain free. His temperature is 98.1°F (36.7°C), blood pressure is 127/81 mmHg, pulse is 87/min, respirations are 15/min, and oxygen saturation is 98% on room air. Neurological exam is within normal limits, except severe pain is elicited with light palpation of the patient’s face. The patient is requesting morphine for his pain. Which of the following is the most likely diagnosis?