Hello! Thank you for your question on HCM! I appreciate your concern. In this situation there are some possibilities that can be the cause of your headache : - A high blood pressure during the episode could cause this type of headache - A subarachnoidal hemorrhage from an aneurysm, a small hemorrhage can cause similar symptoms - Orgasmic headache : this is a benign headache which occurs during this situation. So I would recommend to consult with the neurologist, have a careful physical examination and a brain CT scan if necessary. I would also advise to monitor your blood pressure. Hope to have been helpful! Greetings! Dr. Aida