My favorite world is stuck generating world, building terrain

I was playing yesterday, when I died in nether, so I respawned inside my house, and switched to the creative mode, and tried to run direct to the nether portal. When I was running, the screen has been freezed, and I've had to close the game. When I tried to enter back again, the world couldn't be loaded. It stucks on "Generating world" and "building terrain". I tried to wait more than 30 minutes, without sucess. I realy want to play in this specific world, because i worked on it for more than a year. I wish that someone could help me.