Minecraft crashed and a sqaure of my huge house was deleted

I was just walking in my house and I started to mine a block and Minecraft froze for a second and it exited and a crash report appeared. I went back on my world and I spawned in my house, only that half my castle was gone and there was supposed to be a perfectly flat area, but there were a lot of trees and grass and it looked exactly the way it was before I built my house a long time ago. I lost a lot of stuff and the house was very huge and it will take forever to get everything back. Please restart the game somehow and make the world back to how it was before it crashed. The world was called Jungle Fortress.