The Catholic World Report: Since the feeling of anger is natural and unavoidable, Fr. Morrow said it is important to know how to express anger or displeasure in an effective and positive way. The first step: decide if it is worth getting angry.
“People get angry about little, trifling things,” he said. “You have to say “Is this worth getting angry about?” If not, then you have to let it go. Just forget it.”
If your anger is justified and a confrontation would promote the good of the other, use humor or diplomacy to express your anger. If a confrontation would not promote the good of the other, then Fr. Morrow suggested offering that anger to God as a sacrifice for your sins and the sins of the world.
“(Anger) won’t go away automatically in one try,” he explained. “We have to keep giving it to God as a sacrifice.” Full article is here.