Thanks for your input; sounds daunting/discouraging, but will keep all of it in mind. We have a few Don Croft Zappers here, and the brain tuner certainly looks intriguing and may be something we will pursue. I got something sort of similar from Dr Norm Sheely (not sure if you are familar with him) back a few years ago. When I wore it, it increased my anxiety tenfold and ended up in the garbage! So it goes...
Thanks much
R