Saw this thread and just wanted to comment quickly, I've wondered myself about the potassium issue, I tested low-K several years prior to any symptoms although the levels been normal the last 3 years.About one year prior to the blowup of my BFS-type symptoms, I came down with horrible heart palpitations (skipped beats), at their worst several within a minute to the point where I'd be short of breath. Cardiologist workup was completely normal, said I have the heart of an athlete, go figure - no solution unfortunately. I tried every vitamin to no avail, finally I stopped using added table salt and replaced with a potassium salt substitute (tastes like s*it) and they were gone. The heart of course is very sensitive to potassium and electrolyte imbalances.Unfortunately supplementing potassium and magnesium have done nothing for my BFS crap, but I have to wonder if some issue with the K-channels predisposes us to this nonsense. The other standout in my blood work is consistently low white blood count starting 2 years ago. Exactly on the bottom of the acceptable range, which I understand can be a sign of an autoimmune issue. My immune system seems to work fine, last time I came down with even a slight cold was maybe 3 years ago - but I have to wonder if it's all connected somehow.