What I understand, is that it is a quick pain. Like two rocks hitting each other in the back of his head. It is very quick - happens in a second or two then gone. Anyone have experience with this? He does have a physical scheduled for next week (if road conditions cooperate - maybe we will go the night before and stay at a hotel?). I have not heard yet when his next neurological appointment is - they don't make appts 6 months in advance so were going to mail me an appointment. I don't think his migranes had this symptom. Thank you!