This past Tuesday I had a bout with positional vertigo that lasted about 20 minutes during which time I became increasingly nauseous and broke into a cold sweat and while leaning on the counter I fainted. By that afternoon I was back to normal activities I have felt fine since with the vertigo now gone also. I had tests at the emergency room today including cat scan, ekg, blood pressure, blood work, urine, and chest x-ray and all came back good. Should I be concerned of any serious condition not identified by the hospital today?