Wasn't c2 autosaving for you along the way? Have you tried to load that?
Sucks mate, that has almost happened to me before. I know its not the best time to say but saving regularly to different files is good practice.
IT WORKS NOW! For absolutely NO REASON AT ALL, it just starts working out of nowhere. I don't know why or how. I went to go fix some other (completely unrelated) issues that I had and came back to see if I could try again, and LO AND FREAKIN BEHOLD, it works now.
Just as mysterious as it stopped working. It's working again. It's kind of bittersweet in a way. I'm ELATED that it's working again, but I'm still kind of upset that I don't know what happened.