Have you recently (or ever) backed up your files, as per LadyCFII's guide? If so, restoring your game should be fairly straightforward.
If not, then I think it may be tough to get your game back - LadyCFII, Charley or some other luminary would be better able to advise you on that.
Good luck, and be sure to backup regularly from now on! I learned that lesson the hard way myself
