That's a great idea, and yes, there are several short pieces I can suggest to you. Many physical therapists like to use guided imagery to augment the work they're doing with their patients.
For one thing, health psychologist and hypnotherapist Carol Ginandes PhD has a terrific set of hypnosis and guided imagery exercises for Rapid Recovery from Injury, designed as a 6-week sequence to help with pain and healing. There are several shorter exercises on this that would dovetail perfectly with what you're trying to do.
You can also use our Guided Imagery Mix, which offers several short (8-10 minute) relaxation and imagery exercises.
And we mustn't forget the awesome and prolific Emmett Miller's Ten-Minute Stress Manager, as a good bet and, as promised, is only 10 minutes;
David Illig's Reduce Stress & Anxiety, is Ericksonian hypnosis at its finest, and, as such, you can really start it and stop it wherever you like, because it's not like there's a hard-and-fast sequence you have to follow.
Tracy Carreon also has three lovely guided imagery meditations that are brief and very effective on her CD, A Moment's Peace.
And don't forget Steve Kohn's soothing, calming music just by itself – some people prefer it to a guided imagery narrative – and it's great stuff. Any one of the three in our collection (http://www.healthjourneys.com/Store/Products/Health-Journeys-Music-Combo/469/) will do it, but you may want to listen to samples of each to find the one that most appeals.
I hope this helps! And have fun with your new career!