Game crash and Computer crash that deleted my World

The world was a maze for an in school Passion Project, I was doing finishing touches to the almost finished world which I was adding Tropical fish to a small pool that had slabs and stair waterlogged blocks in it. When I was doing this, the game began to lag extensively and then stopped. I took note of this and wondered if the fish caused it? What that in mind, I continued to make a hidden player detector with a Pufferfish hiding the wall so when a player got close, the pufferfish would activate a pressure plate that would then go into a command. I was about to enter the command and the game froze, hard-locked. I decided to let it to it own thing but then, I got a blue screen crash error and the computer restarted. When I got back into Minecraft, My world was completely missing! And it aggravates me because tomorrow I was supposed to do my presentation and see who would get through the Maze the fastest, but now it's gone. P.S. is there any way to recover my world? I did not back it up for I did not think this would happen.