Well, I tried the autosaves, but Hammer, in its infinite usefulness, made its last autosave on June 8, when I hadn't even built anything. As for the vmx file, it was missing all non-brushes too. I just deleted all my remaining entities and model-related clippings. Time to start them over... -.-
EDIT: NOPE, NOT EVEN TIME TO START OVER. Right after I started editing the map again, Hammer decided it wanted to crash because I resized an areaportal. God dammit, I hate Hammer. I'm going to go play TF2 :<