I once had a shrink who told me to think of my perfect place of peace and calm – an actual physical location, whether beach, desert, mountains – and retreat there in my mind when I was feeling overly anxious. What would your Perfect Place of Peace and Calm be? It can be somewhere you've been or a completely fictional place. Describe it.
In Aruba, I laid by the beach in a hammock for several hours... you never get too hot, because the trade winds keep a nice breeze on you, and the sound of the waves crashing is hypnotic. I paid for it with a monster sunburn on every place I hadn't hit with sunscreen (eyelids, bottoms of feet, etc), but it was still far and away the most peaceful morning I've ever had.
That is the perfect Place of Peace and Calm (if you ignore the subsequent sunburn). I would definitely use it as the place in my imagination that I would retreat to for a mental break!