I normally open up my project and try to change some things in the editor (not game tab) (2d as well) Anyway, when I zoom in, all of the game objects disappear, they still have collision and I can still see them in the game tab. I tried zooming out then zooming back in, but that just made it worse. I would appreciate any help because I am very confused 
Look for the corner in the editor window where it says Gizmos, to the left is a camera symbol, here are some options that limit the near and far clipping planes.