Good Philosophy
Adopt my philosophy. If I have a trivial annoyance I analyze it carefully. Was I to blame? Yes? All right, I am glad, because then I can see that it will not happen again, so I stop worrying. If I am not to blame, if I could not help it in the least, well, then I don't worry about it, for that will not help it any, and I wasn't to blame! If it bobs up in my mind again, I say: "Now, look here, you annoyance, I have given you all the attention you deserve; avaunt, depart, get out!"
Simple
Now, how is this philosophy going to help you gain?
Lost Calories
When you worry needlessly, notice how tense your muscles are. You are exercising them all of the time and using hundreds of calories of energy. You raise your blood pressure, the internal secretory glands may overact (re-read what I have said about these glands in the fat people), and thus many more calories are used. The intestinal secretions do not flow so freely, you have indigestion and do not assimilate your food, and thus hundreds more calories are lost.
It certainly is impossible to gain unless your food is assimilated.
Develop Poise
So the first thing you have to learn is this mental control and to relax. Remember that word, relax. After you are better nourished your nervous system will not be on hair-trigger tension, and it will be easier for you.