Then to his roommate. Then to his professor in the classroom. And finally, he gave his speech in front of the whole class. Active Relaxation through Biofeedback. By working with a therapist or a doctor trained in the use of biofeedback you can learn to reprogram the way you respond to stressful events.
Meditation is a powerful relaxant.
I often do this with Psalm 23, prayerfully reciting the psalm to myself, imagining it's vivid, soothing scenes and entrusting my concerns to my Good Shepherd. I also like to meditate on nature. Near my home is a lake, many sycamore trees, flowers of all types, and music-making birds that I use to focus my thoughts through reflection and prayer. This is commonly used in eastern religions, but is safe and helpful for Christians too. Simply pick a comforting word or a phrase and focus on it, repeating it over and over.