Hi, I don't have any advice for you, I just wanted to offer sympathy as a fellow frustrated turtle. I also had all of the blood tests done that found nothing, and also carry more muscle on my frame than most people.

One thing you may ask about, I take spironolactone (100mg daily) as an anti-androgen to prevent acne, but it also happens to be a diuretic. It is very similar to the birth control pill Yasmin, which has the same diuretic effect and is said to prevent the normal water-weight gain associated with the pill and TOM in general. If you're not currently on the Pill, maybe you can ask your doc about it? Or ask about switching if you are?