There are a few of us who seem to have trouble hanging onto our minerals when we start a diet like this. It happened to me severely when I went on the Fat Flush (nothing like drinking 64 oz of cranberry water a day to lose a bunch of minerals) and it also happened to a lesser extent with PB. I think some of us also have a lower tolerance for a low sodium diet. While CW extols the virtues of low sodium, I just can't handle it. I can't even get a bp reading on a machine when I'm low sodium; that's how low my bp drops and I was borderline high before.
I had an episode almost exactly like you described one time when I started dieting and exercising. I went to the ER because of my irregular heart beats (the Internet basically said that it could be harmless or fatal and that scared me since I had an infant at the time and wasn't taking chances.) After a full, high dollar workup, the only thing that was found was a low magnesium level. I think magnesium tends to be more of an issue than potassium because we get so much potassium on a primal diet but just about everyone is deficient, to some extent, in magnesium.
I have started supplementing with magnesium taurate by Cardiovascular Research. Not only does my heart seem to be in great working order, but I feel the taurine is helping my digestion. I had gall bladder like symptoms at first. I think my gall bladder was in total shock from all the fat.
Also, you might read up on adrenal fatigue. i think that can be the mechanism behind the symptoms we have when starting this WOE. People with adrenal fatigue do not tolerate low sodium well at all nor do we handle extremely low carbs.
True healthcare reform starts in your kitchen, not in Washington. ~Anonymous
The worst carrot is better than the best candybar.--TornadoGirl