You always have time to breathe.
Seems silly, but taking a few deep, deliberate breaths can do wonders to calm you down and help you focus. Make sure you breathe all the way in to your diaphragm and fill your lungs. Then exhale slowly, concentrating on nothing but the slow inhale and exhale. 5 truly deep breaths should take about 50 seconds – that’s less than a minute of your day to look after yourself in the simplest way possible!