I don't really get motion sickness when playing games, but a lot of my friends do! I'm one of those people that can make the character spin around like crazy for fun and never gets bothered by it. Or that silly thing you can do in Portal 2, where you put one portal above the other, jump in, and get put in a forever loop! My friend nearly threw up doing that, but I thought it was super fun!
I DO however, get over whelmed if I'm playing an FPS and suddenly get surrounded by enemies. I'd constantly jump off things and constantly accidentally murder myself when playing BioShock Infinite, because I couldn't tell where I was going and trying to run and get a vantage point.