My whole entire survival world is ruined from a glitch

Please help I've spent so much time on this world and I loved how it was coming together. One day I was playing and I go outside from my underground mine and all my buildings, landscape, mobs, got ruined by randomly generated structures throughout my whole entire world. It's weird I've never seen anything like this before, mob spawners stopped working all my buildings have been separated by giant chunks of land. It's like someone went on my world with edits and griefed everything but it's my own single player world so that's not possible. I'm just mad how much time I've spent and now it's ruined. Is there any way I can reverse this???? I have a recording of what it looks like before but i cant attach