I have found that eating fruit by itself tends to make me more hungry and causes problems with my sugar levels. However, If I add a protein with that fruit My sugar levels stay even and I can go longer between eating. One of my favorite snacks is an apple with a slice of american cheese.
When I am in a stressful situation, I stop what I am doing. Then I take several deep breaths. After that I Think of positive ways to deal with the problem. Then I choose one of those ways and change the problem to an action of success.