Repressed Anger is Dangerous it does not go away.

BE ANGRY, AND yet DO NOT SIN; do not let the sun go down on your anger,
and do not give the devil an opportunity (Eph 4:26-27)

Deal with your anger immediately and there on the spot, do not leave it for later, because unresolved anger goes down into you and starts festering and growing into resentment until it gives birth to hatred, and then the devil shows up with the words of sympathy... "You don't deserve this" or "you are the victim in this marriage"
When devil appears sympathetic, brother run!!!

If you do not take your problems in prayer to God, you will take it on people.

Here are the ABC of dealing with anger:

A = Admit that you are angry
B = Brainstorm it in the light of the Word of God
C = Control your anger in Godly fashion.

When you are angry, slow down and take time to make decisions and speak.
Force yourself to pray for the person you are angry with.