3.3 Short-lasting unilateral neuralgiform headache attacks

A 36-year-old graphic designer reports recurring pain first noticed three weeks ago. She describes isolated, single stabbing sensations of moderate intensity, felt right inside and around the left eye socket, never crossing to the other side. Each episode is short-lived, lasting only around two minutes, and she has kept count of at least twenty-one so far. Her left upper eyelid visibly droops during the pain, something her colleague pointed out during a meeting, and it lifts again once the stab has passed. She currently has about two such episodes on an average day, often triggered by nothing she can identify. She denies redness of the eye, tearing, or nasal symptoms, and reports no recent head injury.