Day 10 Water Fast -- Dealing With Complications; Need Help

Hello, friends. Ever since yesterday morning, I've been dealing with an increased heart rate, and can only get six hours of sleep at most. I've been taking two to three 1g salt tablets every day, except for the first day when I took four, and the day before I had the heart issues when I accidentally took only one.

Day one, I used the method from Tools of Titans to enter ketosis as fast as possible, drinking water and popping salt while taking a several-hour walk. I had no "detox symptoms", and my hunger went away day three. On day, four, my energy went through the roof, and stayed that way until day nine, when I woke up with light cramps and the abnormal heart rate. I've only been taking salt and water.

Is there anything I can do without breaking the fast? I really want to make it at least 21 days with the hopes of shedding my loose skin from when I lost weight, as well as my stretch marks and a gnarly gash down my chest.