itunes library erased

Hi there. Big trouble in little imac. I recently went away for a week and came home to find my itunes library completely gone. Not only the songs that I uploaded off the Internet but the nearly 400 songs I uploaded of my own cd's. Very frustrating. I did still have the files from Limewire in the folder so I imported what was there into itunes but alas, all the typing that I did to correct and improve upon the layout and organization of my music is GONE.

Any ideas as to what may have caused this??? I had even been creating new playlists by albums and they are gone. It looks like itunes reverted back to when it was never used. My carpal is not doing so well since this happened!!

Any help would be sooo appreciated.

Thanks,
iz

More information is needed in order to resolve your mystery. What did you do, or what was done before the data went missing?