Hi i appreciate your concern in my opinion thyroid problem may be a contributory factor for weight gain don t loose your mind still you can reduce and maintain ideal weight My advise to you are as don t skip any meal 3 regular meals and 3 snacks in between Avoid fatty fried and junk food like pizza pasta burger have plenty of fluids 5 to 6 liters a day regular exercise consistency is more important than a vigorous workout in a day have good sleep and lead a stress free life everything gonna be OK Hope I have answered your question Wish you good health take care