As the others on here have said, if your numbers are really going out of whack then up your basal rate, making sure not to forget to watch closely for the return to normal BGs as you don't want to start to going too low. This is just what you would do if you were ill and your BGs were elevated.
In the last few years, I have learned to do three things which help me relax under really stressful circumstances. I consciously tell myself to breathe - I know that sounds silly but it really helps me to breathe in and out more deeply, exhale through my mouth and inhale through my nose. As the others have said, exercise is great for helping to cope with stress. Finally for me, doing crosswords and other puzzles helps me to destress too - obviously that doesn't help everyone but if you can find something to distract you, if only for a while, it helps your body to become less tense.
A combination of methods is the way to go I think if it works for you. Hope you find your way to cope with stress.

__________________
Anne
Diagnosis: April 9, 1968
Pump (508): September 2001
522 + Sensor: February 18, 2008