Re: zappers/frequency generators can make some parasitic worms go to the head area.

So you prefer the approach of "it works because i say so"
The problem is that your beliefs or opinions will not change the reality.

Hence the necessity to do experiments with only one treatment at a time and to do objective measurements of the results. Else you are just fooling yourself and spreading false infos.

I think that personal experiments are good enough if they are done by following the scientific principles.

I encourage you to continue your tries, a new view and new approaches can produce interesting results.