Maybe the issue is not so much that you need to not get angry as that you need to express the anger in a healthy manner? Or be able to get angry and still stay present and not get lost in the anger?

For me, fear is the emotion I tend to feel most, and I get lost in it. I've learned to tell my T "I'm feeling very afraid right now, can you please help me stay present?" If I ask my T for that, she will help me. Maybe yours would be willing to do something similar. Maybe you could tell your T "I'm feeling very angry right now, can you help me redirect that?"