I've been trying to remember the title of this fantasy book. I believe it was from the early 90's.
It was about a human boy who was at a party, gets in trouble with some rough teenagers and gets chased out onto some ice. He falls through and as he is drowning gets sucked into a magical world. There he meets a girl and a guy who help him understand the world he is in where people from other worlds end up. Also they have to overcome trials, like his drowning. Then there is a girl who is claustrophobic, and also I think a guy with a fear of fire.