Once u know that u have no control over those things, why should u dwell on? As it is common feeling, u should take control of ur mind and thoughts on such situations. It takes time to practice the act. Once u start controlling ur mind and negative thoughts u will never have that bad feeling
Live with the moment! It is life and stressing over the little things will just make the little time on this earth less enjoyable. Enjoy every second and find healthy ways of coping through the bad moments. Stay Strong, Life may be hard, but it's life.
If there is truly nothing I can do about a situation, then I shift my focus to something I can control, which may be as simple as breathing. For me, yoga practice is a great way to shift my state of mind and bring myself back to my breath.