Level replaced with old version, current one gone!

So, I was creating a new level in my project today, and than I went back to my other level and it wouldn’t load up because I was apparently missing some references. So UE4 replaced my level with an old version of the level that does not have missing references. I have lost a lot of work and am in a bit of a panic. My current version of the level seems to be gone and I don’t know if there is a backup. The same older level keeps loading every time I open I backup save. Please help!!!

Funny. Ue4 just reverted my whole level back to the stock new level. Guess I’m gonna have to back things up every ten F seconds