My ipod nano 6th generation is not working anymore :( HELP

I have an ipod nano 6th generation. Was working perfectly. One day I wake up and is showing me a screen I have never seen before..It reads:N20 Snowfox 4A0432

When I plug it, itunes doesnt recognize it. It recognized it once but it says problem 1621 and I follow the instructions but still my ipod is frozen and not even my computer can read it.

I really miss my music for my morning run!