If I’m having a particularly stressful or overwhelming day, I repeat a mantra while I meditate. A mantra is a “sound, word, or phrase that is repeated by someone who is praying or meditating.” (Merrian-Webster.com); you can repeat it silently in your head or out loud.
To create your own calm mantra, think about how you want to feel or be, then state it affirmatively. For example, one I use often is “I am calm and centered.” Saying a mantra while you meditate can help you: 1) Focus on something other than what’s bothering you; 2) Relax; and 3) Believe what you’re saying is true at a deeper level so that it actually becomes true.
“Never underestimate the power of words. You make your world with your words.” – Dee Rimmer