"Worrying does not empty tomorrow of its struggles, it empties today of its strength," Come Ten Boon
How much of your life is wasted worrying about things that haven't happened yet? Probably a fair amount, and that worry isn't just a waste of time it's positively bad for you. Our bodies are designed to cope with a certain level of stress, but more the occasional running away from a wildlife, rather than a constant thought pattern of worry. This constant level of stress is over-stimulating for our nervous systems putting the rest of our body out of balance and in the long-run can lead to fatigue, accelerated aging, weight gain, blood sugar imbalances, suppressed immunity and in some people total burn out. So letting yourself get worked up can be just as bad for you as eating a packet of crisps or a bar of chocolate.
Being stressed is something you have more control over than you realize - things may happen around you that could be a source of stress, but you can choose how you react to them. So next time you catch yourself getting worked up, remember that this is bad for your health and so you need to stop this thought pattern, whether that's by actively doing something to address whatever is stressing you out, or recognizing that it is something outside of your control, clearing your mind, taking a few deep breaths and letting it go.