Find a quiet space to listen to this song, "Sittin' On The Dock of the Bay," by Otis Redding.
While you are listening, close your eyes, and picture yourself sitting on the dock of a bay. What does it look like? What does it sound like? Smell like? Really concentrate on your version of that imaginary bay.
While you listen and imagine, breathe deeply, and think about relaxing into that space you are imagining. (Maybe you'll need to close your eyes to do this). Think of this place you are imagining as your happy and peaceful place. Listen to the song a couple of times if you need to or want to, but stay in that happy relaxing place you've imagined. Try not to let the stressors of the day creep into that place.
When you've finished listening, relaxing and imagining, take a deep breath and approach your day knowing that now every time you hear that song, you'll be able to go back there in your mind to that happy, peaceful, relaxing place you've imagined.