World not generating on minecraft Xbone 360?

I have put endless hours into creating a world on minecraft that has massive structures and beautiful buildings. However, after I downloaded an update, I tried to load the world and nothing came up. I was spawned into a world with NOTHING ON IT. This made me furious, so I went into system>storage>games>minecraft>worlds, and it said the world was saved. I was confused af, and I don't know what to do. Can anyone help me?!