I would try to restore your OS to an earlier time, assuming you can do this on a Mac.
I had a scare the other day when my computer was acting slow; I restored it back a few weeks and when I went to open a show file I had been working on all the "show" files for ALL my shows were gone. I checked the folder with all "MyShows" and everything was gone except the folders for each show.
I looked in the "beams" folder and found a "Myshows(2)" folder with everything in there.
Good luck with whatever you do. Losing a lot of work always sucks.