Thyroid
If you are not within the proper range with the thyroid then they should be giving you medication. If it isn't far enough off for medication then it shouldn't be causing you to gain. We also need to know what surgery you had RNY, Sleeve, lapband or DS that also makes a difference. Everyone is quick to blame their thyroids but 9 times out of 10 it is because the eating has gotten out of hand again.