When we are born we breathe properly, ie with our stomachs. As we get older we learn to breathe in a more stressful way, from the chest. "Belly breathing", as it's known, can be very effective with managing stress. With this type of breathing, when you breathe in, your stomach should move out as your diaphragm expands. If this doesn't happen at the moment, then you can learn a new breathing technique.
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This type of breathing is a professional stress management technique, and many actors and opera singers use it. Not only can breathing in this way help to overcome nerves as it relaxes the body, it also improves your posture and voice, helping to build self-confidence.
Stress is a medical condition and it can have a serious effect on your health. If you think you are suffering from stress it is crucial that you consult a medical professional.