I have an iPhone 5 with iOS 8.1.2 and I have iTunes v12.0.1.26

I have an iPhone 5 with iOS 8.1.2 and I have iTunes v12.0.1.26. I have one computer that I sync my phone with and it is Windows 7 Home Premium SP1. iTunes has removed my playlists from my library but my playlists are still on my iPhone. I added two musc CD's to my library but iTunes won't add them to my iPhone. Also, I keep getting music duplicated on my iPhone. My apps sync just fine, I am having problems with my music. I removed duplicates from my iTunes library but I still have lots of duplicates on my iPhone. How do I get these cleaned up? I want my playlists copied from my iPhone back to my iTunes Library, the duplicate songs removed from my iPhone and new music added to my iPhone. Will someone please help me with this mess?