Hey, what´s up guys

Hugs from Mexico

Well, yesterday, I was playing normally, then, I puased the game and clicked in "Save and exit".

I didn't close or minimize Minecraft, so, when I came back, I open my world as usually, but I spawned God knows where and I lost all my stuff, diamonds, redstone, complete armor, enchanted sword, and a lot of material and tools.

How can I have them back?

Thank you guys!