Do things to distract yourself from eating. Go on a walk. Take a warm bath. Drink some hot tea. Window shop (maybe not near food places).
Perhaps most importantly, get a journal and write how you feel, what your goals are, and what behaviors will help you accomplish those goals. Take some time to envision yourself in a bikini, favorite dress, etc. I agree with you that you're mostly having psychological stresses; so use psychology to your advantage and think positive.
