Take high fiber low fat diet. Drink lot of water everyday. Take fresh fruits and vegetables a lot to feel fresh and get rid of dark circles. Do meditation or yoga to get rid of stress. Take small and frequent meals at regular intervals of 2-3 hrs. Take high protein foods like all milk and milk products, eggs, pulses, sprouts, nuts, tofu, rajmah, chole, soyabean, paneer, chicken, fish etc. to get stamina and avoid weakness.