Taking too much baking soda can cause things like this...
The Dangers of Alkaline
Arrhythmias
"Excesssive alkaline levels in your body fluids may develop heart arrhythmias. Arrhythmias occur when your heart beats too fast, too slow or otherwise irregularly. Symptoms of arrhythmias may include chest pain, fainting, heart palpitations and shortness of breath. Your skin may become pale and you may sweat more than usual if you develop heart arrhythmias."