I have never showed anger in therapy. I need to. Anger is a strong motivator for me to talk. My therapist just doesn't push my buttons to make me angry. Some days, I wish she did!

I would thinking during you'd feel angry. After, probably a little bit of relief and apprehension. To get an emotion as strong as anger will lift a lot off your shoulders, however, it could make you worry about showing that anger and cause apprehension.

I think it'd be wonderful if your therapist can think of a way to have you release this somehow safely in session. If you do this, no one but you and your therapist have to know about it. He is not going to leave you over it because he has set it up for you and made it a safe emotion for you to finally feel. You will not hurt one in this process. It's a very, very healthy thing.