I had a sudden painful headache in the back of my head(slightly to the left) and i was able to hear my heartbeat for the first 3 minutes ?

Headache: How long does it last? Any previous episodes? History of headaches? Need more information to help you.

New headache: Headaches can be a concerning symptom and can have many causes. Some are deserving of emergent treatment. Warning signs are chronic headaches that suddenly change in quality or intensity, multiple headaches a week, new onset headaches that affect one's ability to function, associated vomiting, associated dizziness/double vision/neck ache/fever/weakness, or the need to take daily pain medication.