Hi. I don't know whether the zapping sensation is anxiety. Sometimes the aura I experience before a migraine includes what I call tingling.
I also had a ct scan a few years ago. The neurologist said one said of my brain works slower than the other, but there was nothing he could do to correct it. So, that causes me worry at times when my head doesn't feel quite right.
I'm here for moral support if you need it. I'm not a doctor, but I've met a lot of them...lol. Hope you feel better soon.