Have you ever had to make an unexpected U-turn?

About a year ago, I was driving to a meeting at Hidden Villa, a local organic ranch where I was supposed to do a children's program on chocolate. At a traffic light, I could feel my heart swell and pound out a few heavy heart beats that didn't feel all that regular.  My left arm tingled a bit, although that could have been because I was resting it wrong on the car door.