Hello Friend, Good that you are seeking a help. Emotional disturbance like Depression, Mood swing, stress etc need not be always linked to emotional issue. Sometimes body physical condition like excess heat, digestion issues, acidity, weight gain etc can also trigger  such behavior and negativity. Moreover medicines are just one part of any psychic treatment and also has some side effects. So, In addition to medicine, you need to consult a Psychologist to get the recommendations on few self therapies, dietary changes, lifestyle changes, excersise etc to have permanent cure. In fact, such non medicine treatment can also help you in gradual weight reduction. Don't hesitate to to consult a Psychologist to assess your current condition to recommend suitable solutions.