If it is Fister's thyroid, he will be just fine. Mac was just diagnosed with hyperthyroid a couple of months ago and the meds (not totally inexpensive, but affordable) keep him fit, happy, and still ruling the roost in my house. You'd never know he is 15 and has a thyroid disorder. I am sending best wishes to dear Fister! Keep eating and drinking well, Sweetie. That will keep your Meowmie from worrying too much.