Hi thanks for your answers. the zapper I used is stronger than the Terminator, the EX goes for extreme. While the terminator seems to cut the 9v battery to 6.5v or something, the Z4ex doesn't, or does so much less. I used the copper tubes. In any case, all this buzzing twitching 24/7 madness was not the only damage, carpal tunnel to my left hand with sharp pains in the palm of my left hand and incompetence in my left leg (great saphenous vein deriving in varicose veins in that legs) also happened after the electric shock.
I might be the only unlucky one then, but al this came after my terrible experience with the zapper, from that I am 100% sure.
@Parazapper, is there any chance that you could find those other two cases that claimed to have suffered effects like mine. I would like to get in touch with them and ask how is it going...