A sweat bath and or sitz bath can be done 1-3 times daily for life.
The operation may not be reversable. I do know of one woman that had loss her thyroid function and was suppose to die of a heart attack, I guess when the blood shows you have lost your Thyroid, your done and the heart blows.
She ended up with the Amish and several calls to MDs all proclaimed her eventual death. One call to a very famous medical clinic (that would fire the MD) proclaimed the FAST would cure her Thyroid. Instructions were given and the Amish fasted her for 13 days and on the 13th day her blood levels were normal and she wnet home. The same medical clinic that gave this information would never dream of fasting a patient to save her life.
I suggest living as close to Nature as you can the rest of your life. Eat lots of plants from the ocean and a fruit diet.