Help, all my meshes have disappeared! Presentation tomorrow

I was loading up my project, and my PC had a hickup during the loading, not sure why. But when the project opened, suddenly almost all of my meshes have become invisible. You can still select them, but there is nothing rendered.
For some reason only sprites are still there, but some of the icons have become horizontal.
Any ideas?

Are you using source control? Roll back.

Did you try clearing your Intermediate and DerivedDataCache for instance?