Thanks for your comments, adbsteve.
Since we cannot have much control on what happens outside us, calming down in the face of unpleasant situations becomes essential. So breathing according to different spiritual techniques is most helpful. It is important to avoid adding emotional baggage to the one we have been carrying for years and will hopefully release one day.
Getting angry is no more than hooking into the negative energy of another person, group of people or situations. This is why acceptance becomes important. You let things be OK, even if they are not.
I am not sure that I agree that your posture, breath, facial expression, etc influences your mind. I like to see it the other way around. If you have inner strength built through years of practicing different spiritual techniques, your external appearance will remain positive regardless of what surrounds you. In some circumstances, people who want to hurt you emotionally will find your inner strength disarming and will not trying to persist in their actions against you.
I see the benefit of exchanging messages on here as a way forward for all of us. We are lucky that the internet allows us to interact potentially with almost any person on the planet.