You should throw out every American metal album you have, except for a select few, Death and Nevermore come to mind. Type Scandanavian Metal in google and you'll find pretty much everything you'll ever want or need.
You're being colossally stupid for the following reasons:
1. You're just fucking wrong about American metal you jackass, go listen to some of the following:
Accidental Suicide
Alice In Chains
All Out War
Anacrusis (Get Screams And Whispers or be a faggot)
Angelcorpse
bored now. Just went through part of the letter A on MA, then got bored. I'd like to point out, however, that you're gay because Black Sabbath are not, in fact, from Scandinavia.