Itunes & my ridiculous ipod nano

So i plugged in my ipod and itunes told me to sync, i pressed cancel as usual. except this time it kept ejecting my ipod and not letting me click on anything on my ipod like songs or videos or anything. so it did that like 5 times then a new pop up came up about an error or something so i pressed okay. It completely ****ing wiped my ipod. I have a 4gb ipod nano, its about 3 years old. DELETED EVERYTHING. And randomly synced on about 50 podcasts?! WHATTTTTT. Now itunes will let me put songs on but it wont let me click on anything on my ipod like songs. Whattt is going on does anyone know?! How do i change it so i can actually work my ipod?!