I had an episode on wed night. i was reversing into a parking when it felt like my car was rolling. i had a previous episode about 3 weeks earlier when i was walking and all of a sudden i felt off balance (not dizzy) and fell backwards but did not ?

Seek medical consult: What you describe may (or may not) be serious. You should seek medical consultation right away, so that a doctor can get more information, & advise you appropriately. HealthTap consultations are available; just start over & click on Talk-to-Dr. You can choose video or text, & you can upload pictures, or documents such as test results. Or, call your doctor's office. I hope you feel better soon!