I think Zapping is more powerful than most of us realize! I only recently bought one and started using it--within about a week, I began to get VERY ILL. Since then, for the last month, I have had severe diarrhea and off and on projectile vomiting.
I suspect it has stirred up very old parasites within me! I just posted asking about this. So yes, I am pretty convinced that zapping may be connected, because I suddenly became very sick out of nowhere.