I don't know if you can do anything, it's just happening and it's taking a lot out of me and I'm becoming extremely depressed and heartbroken and sad.

My worlds are deleting themselves and I don't know why. I worked so hard on two of them and they're just gone. Minecraft was just loading slowly, crashing, freezing. There's nothing wrong with my laptop, nothing else except it was open. Minecraft was just being an asshole. It's definitely a bug. Again idk if you can do anything but I had to tell someone before I start crying at all my hardwork gone. They crashed, or loaded too slowly, so I closed them and refreshed, rebooted. And my worlds just gone. Thanks for reading I guess. Rip worlds I'd worked so hard on. 

Also sorry I don't know what Affects Versions mean.