all my music is still on my iPod but today I tried to put a couple of CDs on iTunes (which I have had to start again from scratch - it's empty apart from the ones I put on today) and it said I couldn't 'sync' to my iPod. I am scared I am going to lose everything on my iPod if I change any of the settings - it did offer me the chance to restore my old systems but said this would wipe my iPod clean! What do I do?!