most of my songs are missing

One day, I was syncing my Ipod.. And I took it off before it was done..

Now I only have, like what, 7 of the 53 I bought. I tried downloading them again through Itunes, and it says I have to buy them again (the ones I dont have currently)

Anyways, I took some screenshot from my Ipod of all my songs.

http://imgur.com/a/FD4tx

I got more..

Well, for some of them, I bought the whole album, and now it only has a few songs and I apparently have to buy the rest of the album