Game crashes upon startup after save and quit, and deleted my world.

Game crashes every time I exit the game and try to open it back up, but this time it deleted all the worlds I made since I started playing bedrock. My main world was Vomega, I just finished weeks of work and there's no way to get it back looks like. There are other bugs LIKE this but none that I found exactly like this. My graphics setting were turned down when it happened.