one of the worst one i experienced was in virginia. i drove from norfolk naval base to virginia beach on a lazy sunday afternoon. on the way back, i felt like i was flying an aircraft upside down while i was stuck in traffic. i managed to inch forward everytime the traffic moved. as my vertigo worsened, i found an empty parking lot of the pembroke mall that had closed down. upon parking, i disembarked from the car and lay down on the pavement, the feeling got worse and worse, i had to hold on to the parking lot curb and stuck both my feet under the car to convince myself i am not falling off the earth. could not call back at the base since i did not have the number. i waited out until the traffic lessened, was able to make it back to base. having complained of the vertigo or dizziness, the doctor did not find anything wrong with me until by accident, i ran out of regular coffee and only had decaf in the room. the vertigo had stopped. the worst dizziness was caused by caffeine overdose. avoid caffeine high, it is very uncomfortable