Playing Minecraft makes me feel ill?

I played it for months and months with no problem until about a month ago. I figured it didn't have anything to do with the game so I just laid down and took a nap and my stomach settled itself. I know it's weird but on three separate occasions this has happened. Even looking at the screen while my brother plays it makes me feel sickly. Why? Can I stop it?

Probably the game making you dizzy - sort of like motion sickness. This also happens on sims 3 for wii. I think it's just the style of game. Best advice would be to not play it and not watch other people play it.