Hello,
So, you're 13 and 320 pounds. Well, I don't know how tall you are but 320 sound definitely heavy. You said you tried a number of diets and nothing is working for you. I think this calls for medical intervention. You need to talk with your doctor or a nutritionist. there is a possiblity that you have tumors in the hypothalamus or pituitary or problems with the thyroid. All of these things need to be checked by a professional. I would go to the doctor as soon as possible. If you don't have insurance and not much money, you might try a clinic. I'm not sure how they work things in New Zealand. Whatever it is, it could be a life time situation that calls for attention now. See if they have any free clinics that you may qualify for.