When you feel something, try to express it (appropriately, of course!). "Bottled up" emotions increase frustration and stress. Share your feelings. Perhaps a friend, family member, teacher, clergy person or counselor can help you see your problem in a different light. Talking with someone else can help clear your mind of confusion so that you can focus on problem solving. Put out "brushfires" while they are still small. Even if it is slightly embarrassing, asking for help soon after a problem occurs may avoid much more serious problems later. Also consider writing down thoughts and feelings. Putting problems on paper can assist you in clarifying the situation and allow you a new perspective.
Create a quiet scene. You can't always run away, but you can dream. Imagining a quiet country scene can take you out of the turmoil of a stressful situation. When you have the opportunity, take a moment to close your eyes and imagine a place where you feel relaxed and comfortable. Notice all the details of your chosen place, including pleasant sounds, smells and temperature. Or change your mental "channel" by reading a good book or playing relaxing music to create a sense of peace and tranquility.