As a person who has carried a
heavy burden of anger for most of his life, I have found the following three-stage technique for controlling anger effective and useful. The technique (thought, word, deed) is based on the yoga of visualisation and affirmation.
Stage 1, Thought. Take a long, slow, deep breath and while you are doing that visualise these words scrolling across a screen in front of your mind's eye:
Thank you XYZ* for helping me understand that there is no requirement for me to feel anger, and that if I wish I can extinguish my anger. I reach deep into myself. I gently and lovingly take hold of my red, boiling ball of anger, bitterness, resentment, frustration...
Visualise the hot, red, glowing ball of anger deep inside yourself. Inside the ball is your angry self, your mouth wide open, shouting, screaming in rage, fists beating furiously against the inside of the ball. Visualise your hands gently taking hold of the ball. Now start exhaling, long and slow, while you continue visualising the words and the images described by the words.)