There are some natural diaretics, particular foods, etc., mentioned were spinach, grapefruit, alfalfa tablets, but haven't looked into them to see if they are bad for thyroid. When your levels of thyroid are correct alot of the water retention goes away. I lost 8 pounds the first month I was on Armour and all the puffiness. Are you sure your FT3 & FT4 are high enough? Be careful about rx diaretics. They can deplete alot of things you need, especially potassium. They tried me on hydrachlorathiazide(most commom diaretic) and I developed irregular heart rythmn in 2 days. Drink more water, eat less salt. Too bad I have such an addiction for salty/fatty snacks.
I've went 4 days without potato chips(I feel like I need the 12 step program).