Signed up to Apple Music by mistake. Want my music back in Itunes

Yesterday I discovered that a couple of tracks on an album I'd bought did not play in iTunes. Advice on the net told me to download the Apple Music app to see if they would play there. (They didn't.) Now I discover that my music is no longer in ITunes and that my iPod Classic won't sync with Apple Music. I use my iPod all the time for music listening and am distraught at the thought of not being able to do this any longer. Is there any way I can get the music library back into ITunes? Also, I am worried that if I can't do this and I now sync the iPod with iTunes to update my podcasts, I will lose all the music now on the Ipod. I am also not aware that I agreed to pay anything for Apple Music but it seems that it is not free. I'm very cross and upset. Help please.