Take a Time Out
If a time out works for children, it can work for you. It's not about punishing yourself, it's about pulling away from all the daily distractions, the frustrations, and the tantrum-inducing surroundings you deal with every day.
If you can get away to a relaxing pond, do it. If that's not an option, a few quiet moments to breathe and to be grateful can restore your equilibrium.