hi there. For weight gain, you can have a nutritional reason where your food intake calories must be much more than the calories you spend on daily physical activity. Your TSH is normal so the other hormonal reason for increasing weight can be that of High cortisol level in the body. But this is a very rare cause compared to Nutritional obesity. You can get your AM Cortisol tested and get back to me. Orofer is Iron supplement and does not help in weight reduction. Your gastric problem might in fact increase with the intake of orofer if you do not take it appropriately. So please check with a good physician about it by getting yourself checked clinically. Take care.