Yeah, unfortunately the iPod is not designed to sync movies/music back to a computer. Your iTunes purchases are likely unable to be redownloaded, though you might contact iTunes support. Once you sync your iPod to the computer it will wipe what is on it and want to reformat for use with the new iTunes library and it’s content. This is probably stating the obvious, but be sure to back up your stuff in the future to protect your investments. I hope this helps.