HELP! My iPhone switched to another country's iTunes store!

I was trying to download a song and couldn't find it in the iTunes app. So I googled "(song name) iTunes" and it popped up. I clicked the link and it said something along the lines of "You have to switch to the Belgium store to purchase this song". I hit the button to switch over not realizing this is apparently a big deal. Well, it wouldn't let me download the song anyways and now I can't get back to the American store. *** Apple? Could someone help? I want to switch back over from my iPhone if possible. I won't be back at my home computer for a while to resync or whatnot.

Thanks!