there are missing builds and missing chunks all around my world

My whole system froze while playing, when i restarted it and went back on my world, it showed me an error when joining. When i tried joining a second time, i found that all my builds ended up missing and world chunks were gone. I restarted the game thinking it would be a little bug or glitch that would go away but it didnt and ive lost everyhting ive built now

I cant seem to find a way to fix this, but if this can be fixed, pls fix it as fast as possible.