[dfraser992]

The first things that come to mind is Buddhism or Sufism. You might think associated meditative techniques would be all that you need, but I don't think them alone do much without a surrounding framework to guide you in changing yourself and how you relate to others, the outer world, your inner world, reality... That is the subtext I am picking up on in your question. Or stoicism like someone else said, if you don't want anything too connotative of 'religion'.

Sarcasm, OTOH, is sometimes useful. It's knowing when is the trick. Justifiable expressions of anger are sometimes necessary; at the very least, ignoring it means you are ignoring something pertinent and meaningful to yourself which shouldn't be ignored. How to take action based on that anger is another question...