Your husband made a very good point. It is really important that these questions are asked. (with out being immediately dissmissed on a very pro zapping site). It is imperative that possible side effects of zapping are investigated (and hopefully proved to be of no consequence). If zappers are eventually to be taken seriously by the general public then this kind of research will have to be done.....sooner or later. Most likely later.
Don't get me wrong I use zappers and think they are great but nobody really knows yet what the true effects on the body are. Until an autopsy is done on someone who has used a zapper for a significant period of time, all that can be done is conjecture.
The conjecture is, they are pretty harmless.
I do know that the zapper burns my skin enough to scab so why not internally?
Therefore try to work out if your health problem is parasite related, therefore is a zapper needed? Nearly everyone has parasites. Not all health problems are due to parasites however, some are enzyme difficiencies/stress related and a whole host of other underlying causes. At the end of the day use your intuition whether the zapper is for you. A zapper is not natural and like any medicine would you continue it blindly for 20 years and expect it not to interfere with your natural bodily functions? The answer....... I don't know.