Often, when one has a thyroid condition and a
weight issue, together,
thyroid hormones are not properly adjusted or there are other issues present, such as metabolic syndrome, insulin resistance, etc. I did see that you posted another question regarding pre-diabetes, which is also known as insulin resistance, which sometimes goes hand in hand with hypothyroidism.
Typically, in these situations, weight loss clinics will not be your best bet, because any weight lost, will not be lasting.