Hi, I play soccer which involves a lot of sprinting after the ball and recently I have been having issues with this. It first started about 3 months ago during a match, I was sprinting after another player when all of a sudden I started gagging and had to stop. Once I stopped sprinting, the nausea and gagging stopped. The next match I played it got so bad that I had to go off as if I didn't, I definitely would have vomited on the field!
I now cannot even sprint 100 meters without gagging. I can run 5 slow laps of an oval with ease but when I start to sprint, I start to gag. I usually don't eat much before a game.