I lost my entire Aperture library, how can i restore it?

I wanted to import an old project from a previous Aperture but it asked me to update to Aperture 3 when i wanted to import that project.

But i'm already running 3.3.1 never the less i did an update to 3.3.2 but it didn't solve my problem, and gave me the same message.

Eventually restarted my laptop and tried to import the project into Aperture again.

This time the screen comes up that normally shows when you hold the option+command key and asks if i want to update the library since it asked me to do that last time i accepted but now my whole library is gone and replaced with the one old project!

And i can't find my old projects anywhere and the size of my library is only 88GB now (it used to be 200GB)

Now i never deleted any pictures or removed my library so i should be able to recover it somehow right?

iv'e been browing the web but havn't found a solution to revert what iv'e done.

Also looked at recovery of deleted files with MacKeeper but there were no files in there that were previously in my library

so doesn't look like it got thrown in the trash.

If anyone has any suggestions please help me regain my old library,

i'm not importing any new photo's or changing anything right now as i'm affraid i'll never get it back.

i do have some projects backed up but not all of them.