Weird about the black sweat. Sort of reminds me when I got eyeliner tattooed on - I blew ink out my nose.

I wish you well with this, Dej! It may take a long time and a lot of money before you know for sure if it works. But if/when it does, WOW! It will all be worth it!

Somewhere in my garage is an old medical device that sounds similar to what you describe. It has hand-held electrodes. They are collector items now but who knows? Maybe they worked.