One of my best parenting tools has been a fresh start. In fact lots of them, every half an hour possibly, until the concept of what happened earlier affects now is graciously forgotten. I am now able to go from active row to happy food making and delivery on a sixpence.
Sometimes I do get stuck in an angry rut. That is really annoying and pointless. Going out for a drive or walk is good. A long hot bath or generally having my own time out is great to break my bad cycle.
Very little actually matters that much.