Help - I downloaded the latest update for my ipod, but instead it seems to have completely wiped it!

Can someone please help me - I have downloaded the latest update for my ipod to try to get it to work with iCloud, to back everything up, but instead it seems to have wiped everything and restored my ipod to its factory settings and now when I try to sync it, it says 'Sync in Progress', but then doesn't do anything.
When I got my ipod I installed loads of music from CD's, other mp3's etc on to my computer and downloaded it to the ipod. However over the past year I have bought all my music and apps straight from the ipod instead of the computer as I bought a new computer and every time I plugged my ipod in to it, it said that it would download content from the computer, which I didn't want to do as there was no music installed on the computer and I didn't want to lose anything. I had also previously read that you couldn't upload music from an ipod to a computer for some reason.
However, I then heard about the new iCloud where it automatically updates your purchases to all your Apple devices. So when I looked up how to get iCloud it said I needed to install the new ios5 to get an account. I then plugged my ipod in to my computer and tranfered all my purchases to my computer. Once this was complete I clicked on 'update ipod' where it said it would update it from version 3.something to version 4.something, so I left it to it, but when I came back to find it was complete, I looked on my ipod and there was nothing there -no music, no apps, nothing except what was there when I first bought it.
I tried to re-sync it to at least get back the 300-odd songs I'd purchased that are on my new computer, but every time I do it, it displays 'Sync in Progress', but then stops and it hasn't done anything. The ipod itself is working fine and I have no problems with my computer, so I can only assume itunes is causing the problem.
Please could someone tell me if there's a way I can restore my ipod and if there's a way I can get back all my music, including the 2000 odd tracks that I had that weren't bought from itunes?
Thanks in advance.

Per Rysz' suggestion, configure accordingly:

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