As you go about your daily life, pay attention to your emotional states. Notice the physical sensations that go with your emotions. If you think a particular emotion is intolerable, break it down. Or maybe you feel too much energy in some part of your body. What if you create the belief that you can tolerate any emotion that flows in you, because, after all, it is an impermanent condition.
Emotions come and they go.
Pay attention to how you are feeling. If your thoughts are generating the emotion, consider that you have the power to change your thoughts.