Hmm, low calcium causing the tingling... Not sure about that since I eat 1-2 servings of green veggies everyday. (I really do. ) But the tingling is very minor and not high on the priority list. The brain zaps are the worst. They completely interrupt your thoughts and actions. I feel like a human bug zapper. Before I was diagnosed with sleep apnea, I did have the constant feeling that I was blacking out for microseconds throughout the day. And I may have actually been experiencing mild narcolepsy. I understand feeling like you're going to black out.