itunes got deleted

ITunes deleted all after the upgrade, how can I recover it?
I recently upgraded my iTunes and deleted all my music, videos, playlists, etc.. Now when I plug my iPod in it says it needs to synchronize with this new library * * and delete everything in my iPod. How can I get my stuff from my iPod back to iTunes? Any help is appreciated!
This link should help … http://support.apple.com/kb/HT1848
TuneAid (iPod to iTunes)
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