Vision acted like head was slammed foreward, pounding headache afterwards

Patient: Last night while i was sitting on my couch watchin tv i had this very odd experience. it felt like my head was thrown foreward but my head never moved but i saw everything around me move like my head was wipped foreward. a few minutes after that i couldnt walk straight nor talk normally and since it happened ive had a throbbing headache that wont go away. can anyone explain any of this to me??

Doctor: