A couple of weeks or so ago I left an extensive account of my own AF, which later involved low thyroid and all of the systemic problem that go with it. My naturopath nailed it with one look at a drop of blood through a microscope with a camera attached. It has a distinctive look. The thing she explained to me was that when the adrenals are worn down the kidneys try to compensate until they end up using up their store of sodium and shut down. That's when the swelling starts. I had that on top of the worst hives I've ever heard about from a congested liver, also from AF. Along with the many instructions she gave me, one was to cut way down on animal proteins to ease the burden on the kidneys, and to add the Celtic Sea Salt to water. Soon, the swelling was gone, although the whole protocol was far more extensive, and five years later I'm just now tying up loose ends, so to speak.