Can I go back to Other saves I made in My Minecraft world?

So I was playing a survival world on the latest snapshot and my friend wanted to play hypixel so I had to change back to 1.8 And we played. When I was done playing I went into my old world forgetting that I was in 1.8. And I immediately exited out ,but it was too late. When I went back to the latest snapshot it said I can no longer play the old world at the moment :(. Can anyone help?? I really want my world back.