you can be hypothyroid and still lose weight (and tone up). once you are on thyroid replacement therapy go on a calorie-restricted diet and start a good exercise program. i can guarantee that you will lose weight; perhaps not as fast as you would like but you will steadily lose extra pounds as long as you are on your diet. see a nutritionist if you are having difficulties and always check with your doctor first before starting any diet.
it's hard to lose weight with hypothyroid. however if you exercise can you at least be able to tone up?