Yesterday I was in a store at the checkout, and I was on my period. As I was standing there I started getting extremely faint, and broke out into a cold sweat. The world seemed like it was spinning around me and my hearing even dimmed out for a few seconds. I was looking around like a crazy person all panic-y wondering what was going on with me. I felt like I might throw up! Luckily after what seemed like a year of bagging my stuff the lady finished. I sat down for a few minutes before attempting to make my way to the car. I staggered to the car, and (someone else was driving) tried to rest. These symptoms went away after about an hour, but were pretty severe. I thought I might die. After I got home and laid down all the symptoms went away completely. I do have really bad cramps when I'm on my period, but this has never happened before. Could this be related? Or something else?