Sometimes one can't reduce or eliminate the stress. Some things are out of our control no matter what choices and decisions we make. In this case, reducing stress means reducing your reaction to stress.
If you're feeling overwhelmed, schedule a breather for yourself. By cheering yourself up, you'll make yourself feel better, and you'll also equip yourself to deal more effectively with tough situations.
So what do you do when an everyday crisis overwhelms you? Get your brain under control and put in the groove. You do that using the power of active rest, using your brain the way it's designed to be used.