This is a friggin' problem that I recently discovered over the last two or so years. Whenever I watch someone play almost any videogame, specifically a third person or first person shooter or games along the lines of that type, I start to feel a bit nauseous, and my eyes begin to feel strained and tired. I also feel like I just caught the flu as I feel like if I watch the game for over two hours, I'll throw up all over something. Like what is this problem? Usually, if I'm playing the game for less than 8 hours, I'll be just fine. It just seems to happen when I'm watching someone play the game.