Dear Welcome to HCM We understand your concerns I went through your details. Just by the given information it is not possible to provide you any advise. You should consult a physician to confirm you do not have any wasting disease or underlying organic conditions or malnutrition which prevents your weight gain and get proper treatment for that. Then you should consult a dietitian to analyze your food habit and to provide a healthy diet. Once you get these diagnosis and treatment, automatically your sunken eyes and dark circles around eyes will be cleared. Don t worry. Stress and worry also contributes negatively to your health. If you require more of my help in this aspect, please use this URL. http://goo.gl/aYW2pR. Make sure that you include every minute details possible. Hope this answers your query. Available for further clarifications. Good luck.