There is the idea that a person needs to lose the mind before he comes to his senses and learns to experience everything through the filter of unconditional love. If you limit your perception to the physical, then you miss what else there is.
As you evolve to touch on timeless serenity, you begin to sense you have choices about how to view anger and come to realize it is a profound teacher. Its not a thing to overcome, it is an energy to work through. Consider how your perspective on discomfort transforms with you as you listen to the body;
1) You are a mirror for everything. If other people evoke anger in you, then you have unrecognized or unhealed reasons to generate anger within yourself. Notice tension and release.
2) You have choices about what to focus on. You create what you believe in. Exerting effort to control what does not exist actually gives it life. You grow aware of the energetic body.
3) You expand unpleasantness or not. You pay attention on the outside or on the inside. The quality of your life is basically peaceful and joyful unless you choose to focus on the outside.
4) You are unaware of what you do. The body and mind are aware of external things and all this can be unloaded or deconditioned. Everything is everything. You only compete with self for acceptance. The illusion of the other disappears as you detach from 'the enemy' or competition outside self.
5) Your perceived disease stems from separation from self. To get angry and impatient at your state of health and well-being, is a natural thing to draw your attention on habits that would benefit from review. Your belief system desensitizes you to root cases of physical imbalance.
6) Your higher self is nature. Nature speaks to you through unfiltered energy. Your paradigm shifts and when you are open, you accept knowing nothing. You value stages of energy flow.
7) You can view control as illusion. As you sense existence in physical worlds, you notice control is viewed as important. To move to understand who you are, you consciously detach from perceived needs to control. You expand or contract at will.
8) You get angry at the self. There is nobody to blame for negative energy you experience. You project your shadow on others as a stage in raising awareness of who you are. When you do not like something, you separate from them.
9) Your diet may relate. Animals are often fed chemicals, hormones and other unnatural things to grow. Vegetables are also grown in various ways and sometimes pesticides are used. What you eat interacts with your biochemistry and energy vibration. How you feel reflects what you eat.