My worlds dissapeared.

I was in the middle of sleeping in the bed with 2 other people in my world and it all of asudeen crashed when i woke up. So i left and try going into the world i was in and it was all black screen and it says [leave bed] or [open chat] and it was glitched screen with a lot of lines on the left side of the screen. It then crashed again and I kept openeing the same world over and over again and it would do that everytime. Then i deleted the game and even tried signing out and that's when all my worlds dissapeared except one very old world i have and i dont even play it.