Probably around the neck area, since the blood vessels are there. It would still be painful since you are basically gasping for air.
No; of course not! When you play a sport, whether you lose or win does very little compared to how you play and treat others. If you win, and tell another player they did horrible, or bring them down mentally in any way, you are being a poor sport.
This could be a sign that the person has bulimia
The answer to your question is C.Viral