To reiterate, negative stress is exactly that. It's not a good thing. Enough of it could lead to physical ailments, like headaches, body aches, and insomnia, which in turn lead to more negative stress and more ailments. For most of us it is impossible to avoid many of the things that lead to negative stress in our lives, so it behooves us to learn to cope with it.
There really are a lot of ways to cope with negative stress. Ignoring it is always an option. Sometimes that works, but often, it will not. Hence, we must all learn to cope. Coping could be either coping with the stressful situation, so that it becomes less stressful, or coping with the stress itself, so that it feels less stressful.
No matter what, coping always begins with breathing. So, stop and take a deep breath. Take several deep breaths, each as slow and steady as possible. Just a few deep breaths are usually enough to get the relaxation started. That's what my exercise guy always says, and he's right.
A relaxed mind is a clear mind, and a clear mind is better suited to take whatever is causing you stress and compress it down to something easier to control. Once we get our stressors under control, well... they sky's the limit, isn't it?
So let's breathe.