Is there anything you can do to release that anger? Journaling or scribbling and ripping the paper up or burning it? Sprints? Go to a remote area and scream?
It might be a good idea to practice being calmly assertive with your therapist (when I know a conversation is going to anger me I "practice" it until the emotions don't show in the form of extremes) and during your next session bring it up.
I hope you get to a more peaceful place soon