You are the one in charge of your emotions and not your emotions in charge of you. The Word of God says, “The spirits of prophets are subject to prophets” 1 Corinthians 14: 32. This also applies to you as a child of God. Your emotions, including anger are subject to you. This is why you could decide to be angry about a particular thing and decide not to be angry about another. The choice is always yours to make.
God is not against you getting angry because it is one of the ways you can express your emotions. However, God is against you being controlled by anger. “Be not hasty in your spirit to be angry: for anger rests in the bosom of fools” Ecclesiastics 7: 9. Do not pride yourself as a temperamental person. Otherwise, you are indirectly calling yourself a fool. Instead, be in charge of your anger; see and handle things from the point of view of the Word of God.
It is important you take a holistic check on the things that typically get you angry. Censor them with the Word of God and at the end, you would discover that a lot of that anger are unnecessary. The same way people or situations make you angry are the same way you upset people too. Sometimes, you never can tell what you said or did that got some else angry. It could be the things you usually do or words you fondly say before, but at this particular point in time, things went sour. So before you get so worked up in anger against another fellow, put yourself in their stead.
Yet another way you can handle anger is through prayers. Ask the Lord to help you deal with that excessive anger and He will oblige you. “For we do not have a high priest who is unable to empathize with our weaknesses, but we have one who has been tempted in every way, just as we are–yet he did not sin” Hebrews 4: 15.
You are the one most affected by your anger and not the fellow you are mad at. Excessive anger can make you do drastic things you never ever thought you were capable of. Anger can also cause you to be sick. It can cause heart pains, headaches, and blurred eyesight and so on. Remember that you are in control of your emotions and not otherwise.