It should provide some immediate comfort to consider that these situations do not directly cause these awful feelings, but it is what we think of these situations. Changing our thoughts can have an enormous effect on how we are feeling. This has been stated by many great minds, over very many years.
"I had the blues because I had no shoes until upon the street, I met a man who had no feet." - Ancient Persian Saying
By reviewing some of the good things in our lives, past and present, we can feel good even in what appears to be a very disturbing situation. As long as there is nothing we can do to fix a problem, dwelling on the negative aspects of it will only make us feel worse and will do absolutely no good. Since it all depends on what is in our thoughts, we can control this.
"The mind is its own place, and in itself can make a heaven of hell, a hell of heaven." - John Milton (1608-1674)
So start listing the things in your life that make or have made you happy. Stuff your mind with other things that make you smile or laugh. Keep it up so as not to let the negative creep back in.
Study babies. They fall and get up and try again and again, and then they walk. They are usually always ready to laugh, at the littlest things. They are constantly interested in new things to learn about, and normally sleep well. If they brood about a bad experience it's not for long."
Things turn out best for the people who make the best out of the way things turn out." - Art Linkletter