My Ipod is Fucked up and I need help.?

My iPod was working perfectly fine and had everything I wanted on it.

Until I went on iTunes and everything on iTunes was somehow deleted.

Anyway now iTunes won't let me put ANYTHING on my iPod unless i delete everything and sync whats in the library which turns out to be nothing.

Can someone Please help me!
Also it thinks my iPod belongs to another computer but I've only used my iPod on 1 computer >_<
 
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