Thanks for the tip about potassium! I'll have to make sure to have more, as I'd been getting cramps in my calves and feet, moreso around the time when I had the racing heart issue. I've heard that's from potassium shortage. I had my OB appt Tuesday, and I mentioned the episodes I'd had with Mirena, that it was the same thing that happened Sunday. She said the hormones in Mirena can mimic pregnancy (can't remember exactly how she worded it). I also have the little spots floating around. I think I've always had them to a small extent, but they have definitely become more noticeable lately. My OB did a CBC and an EKG, but both were normal, of course.