Anger issues stem from a mental fault.
Expectation.
your brain evolved to help you survive by taking in information about the world and creating a mental model of reality that enables you to guess what might happen in the future.
This ability to somewhat foresee future events is what gives you more control over them.
Anger and fear are the body's natural response to guessing wrong about the future. This is because, as a caveman, guessing wrong about what might happen next could very well get you killed. SO your body reacts to being wrong with a fight or flight response.
Most people in modern society are capable of intellectually realizing that they live inordinately safe existences. They can moderate their anger response to being wrong to better reflect the actual threat posed by being wrong in a given instance.
After all...your brain's guess about the future is only a guess.
But many people mistake the model in their head for ACTUAL reality... they form a Covenant of Expectation.
They do not see what they think will happen next... they see what they feel OUGHT to happen next.
And when what ought to happen does not happen... they get particularly angry, rage filled and lash out... many will try and force those around them to have the same experience by purposely thwarting the expectation of others.
In a very deep sense, these angry people are extremely self centered. They have a deep seated, unarticulated belief that how THEY think the world should go is the way it should go...how they think other people should act is the way they should act.
But the origin is the failure to recognize that how they think the world works is nothing but a 'model' of the world created by a brain with inadequate information.
You end your anger issues when you STOP imagining the world you experience ought to be some way other than it is.
When you get a sense of perspective on what REAL suffering is...and learn to pay LESS attention to your own internal state.
Here's a big hint... YOU are not the one getting angry... Your body and brain simply have an evolved response to being wrong... reacting to it as a physical threat.
Part of why you suffer the anger so is that you are not realizing that this is just a physiological reaction... that you take in that autonomic response as BEING YOURS.
Because you mistake your mental picture of the world for the way the world OUGHT to be... you react more severely to any evidence that the world doesn't follow your expectations...
And you assume your reaction to be based in REAL anger, rather than the programed response of the brain to perceived threat. Anger is you ABDICATING control over your own actions... and allowing your brain to run on a very primitive automatic.
You are allowing the non-conscuious evolutionary tool that is your brain to be in control of you... because you THINK that IS you.
ITs not. You are not the voice in your head. That is a language processor that merely converts every idle though into language as a useful tool.
You can shut that voice up... moreover, next time you catch yourself thinking in mental words... stop yourself in mid sentence and REALIZE that you already KNEW what that voice was about to say.
That observational point of consciousness is the REAL you...
And it CAN exert control over the brain that evolved as its servant.
So... meditation. Get comfortable with the silence you have the power to invoke. Learn to divorce yourself from your own mental assumptions and gain perspective on the fact that being wrong is an opportunity to ADJUST your mental model of reality... so that you can better foresee the future.
Here's an example of what I am talking about in the form of PTSD.
I was in a head on car wreck where a blue pickup came across the center line all the way across my lane and still managed to hit me as I was off the road trying to evade him.
Afterward, I found that driving down that particular road, at that particular spot, I would FEEL anxious and nauseous. And if I saw a Blue Pickup coming the other way, I would feel panic starting to rise...
However... I found myself fascinated by the fact that I DID NOT have this reaction traveling the same road in the OTHER direction. Nor did I feel panic when seeing a pickup of any other color, or any other kind of car coming the other way.
Had I EMBRACED this reaction as being something having to do with ME.. I realized I could very easily develop a full blown PTSD... I could easily see that I would start to feel anxious about driving down that road... feel anxious about driving in general... basically becoming anxious about being anxious.
What prevented that was my own ability to divorce myself from my brain's programmed response. Something bad had happened... my brain had taken the moments leading up to that bad experience ... the place, the situation, the oncoming blue truck, and had BURNED that into my mental model of reality as a "watch out!" memory.
My brain doesn't have the conscious volition to recognize that nothing in particular about that road, that direction and that color of oncoming truck was any MORE threatening than any other stretch of road or any other color of car....
But whenever I was going that way down that road it was an image and experience that MATCHED that memory... and my brain was preparing me for the circumstance that it recorded as heralding something bad.
In realizing this I was stepping aside from my physiological reaction and witnessing the action of my brain as an independent observer. It allowed me to realize that that reaction is physiological... NOT conscious.
To this day... when I drive down that road and see an oncoming blue truck...I can feel the adrenaline start to flow and my heart rate pick up...
In that same instant I observe my physical reaction, and consciously dismiss it for what it is... an involuntary knee jerk reaction, because my brain can remeber bad things as a tool meant to assist my survival.
And each time I do this... the reaction goes away... every time I drive that road, the reaction is less noticeable than before.
I am actively re-programming my brain to NOT single out that circumstance as any MORE threatening than driving in general.
This ability to OBSERVE your body/brain's reactions to threats... to observe and identify what the silly things are that your brain and body are SEEING as threats, is the key to long term mental health and overcoming anger issues.
I again highly recommend Ron Smothermon's book "winning thru enlightenment".
You CAN re-wire your brain. IT takes time.
Start by PRETENDING you are not angry.
Because you become the thing you pretend to be.