Hello dear, Thanks for being on healthcaremagic.com.If you would have presented to me as an outpatient,I would have made the following clinical explanation- Abrupt onset severe headache with vomiting must necessarily evaluated for a secondary cause of headache like some vascular accident(stroke) or other structural lesions. I advise you to visit an emergency room,get examined for any neurological deficit and funduscopic examination for papilledema.You may need to undergo a brain imaging study like computerised tomographic(CT) scan to establish your diagnosis.Meanwhile please take analgesic like some non steroidal anti inflammatory drugs.I hope it helps.