Looking for a short story about a box

I'm looking for a short story that I've read a long time ago, I hope you can help me. The plot goes like this : a man wakes up in a strange room, he has no memories of how he's got there. He finds other people in different rooms, but they can't touch each other, there's something around them that prevents them from doing so (like a force field). They start to feel sick if they try to get near someone else. They start to refer to the place as "the box". That's all I can remember. I hope you guys can help me, thanks!