My Minecraft world got deleted on Xbox One. HELP!!!!!!!!!

Hello. Last night I decided to go on my Minecraft world which is on Xbox one. When the game was loading my Xbox froze. The loading was just frozen on my screen so I decided to turn my Xbox off while it was loading. Five minutes later I restarted my Xbox and went back on to Minecraft. When my menu loaded I tried looking for my world, but it wasn't there. I am so confused of why my world got deleted. I need to know what happened because I've been working on that world since 2015 on Xbox 360. I have a backup of the world, but it's far behind. HELP!!!!!!!!