My ipod has deleted all the music but has now gained 7.4mb in 'other'. I don't know what this is and want my music back on it. Help?!

I have plugged in my ipod into my windows computer, scanned and fixed it (which was recommended), now when I tried to sync it again, I couldn't because the memory was used up with 'other'. I don't know what this is and how I can get rid of it, I have no music, films, photos, contacts on it, so am completely stuck! Help me please!