It's gone buddy.
If you aren't using revision control at the very least use dropbox.http://db.tt/YK2TKvrT
I know that in Eclipse you can retrieve old versions of your file through the history pane and I guess that could be a feature request for ST2.
You would need to create the file again, right click on it and choose history then you would get a list of various versions of the file that have been cached in the past. That would be pretty nice. This could also be a plugin I suppose.