Being angry isn’t the sin. Letting it drive for three days is the problem.

Anger is a signal, and signals are not the problem. Something got crossed, and the heat tells you that you noticed. The damage comes afterwards, when it stops informing you and starts steering: three days of rehearsing, a sharp tone with people who had nothing to do with it, a decision made while still hot.

Let yourself be angry and put a limit on how long it drives. Name what actually got crossed, which is usually one sentence rather than a whole case. Then either say it to the person or set it down, and do not let it quietly redecorate the rest of your week.