Is Dieting Stressful?
Have you taken a careful look at your habits and how, realistically, you can go about changing them? Accept that you need to make permanent changes instead of just "going on a diet" in order to lose weight. A support system and/or diet buddy can help when you feel stress coming on about your progress.\
People who tend to stress the most have certain personality traits, like overachieving, perfectionism, a sense of competition and impatience. If you recognize those traits in yourself, then start taking measures to reduce stress and ease the burden you put on yourself.