You'll be better able to handle life's challenges if you give your body enough oxygen to function at its peak. Stop stewing and start doing. It's easy to get paralyzed by stress. Free yourself from the worry trap by tackling problems head on rather than giving in to dread. If you're overwhelmed, tackle the simplest tasks first, and then proceed with some confidence and momentum to the bigger issues.
Laughter is the best stress medicine.
Sometimes a good laugh is the only sane response to an increasingly frustrating set of circumstances. Laughter releases endorphins, which are a natural weapon against stress. Walk it off. Exercise helps the body process stress. It also works as a great preemptive strike against tension and panic.