How you deal with your emotions is directly tied to your personal power. For example, if someone at your office has the power to get you angry, shake your confidence, or make you feel small, then you need to learn about emotional control.
It's best to deal with your emotions first (in this case, anger). Then, tackle the practical problem (better communication). Bottom line: Being overly emotional ― in the work environment ― is not a personal power position.
If you need anything, just email me. I'm always here to help.