It's not uncommon to have anger issues with Bipolar .. The best thing to do is advise your Pdoc and if you have a T have them help you learn coping skills to defuse your anger before it goes off the chart .. If you don't have a Therapist there are many ways to help with anger ... Meditation , yoga , self grounding, remove yourself from the situation and take a walk or better yet a run to burn off the anger.

Good luck it can get better