I don't think anger in and of itself is a bad thing. I think it's in how you express it. I think that telling someone you're angry is productive. I think yelling sometimes isn't so much, though who am I to say that you shouldn't do it? I do it even when I'm not angry. *haha*

But really, I'm not sure anyone can tell you how to express anger. It's more like how one should *not* express anger, and that is in ways which are destructive to other people, or yourself emotionally, mentally, or physically.

Is it something you've discussed with your T?