You and Michael were best friends, and today you screwed up.

You found some kind of bunker and entered it, and there Mike came across something that launched some kind of rocket bomb into this bunker. You opened another thick metal door and entered the room with Michael, but you didn't have time, and you were thrown back by the blast wave. You miraculously survived, but, unfortunately, the entrance was blocked by the heavy destroyed walls of the bunker

(And you're also a crazy psychopath whose life is mixed up with your nightmare, and now you periodically see some monster from your dreams and hear his voice. Good luck! ;} ..)