I recently made a home-made iontophoresis machine using the info given from the link: http:// YouTube - Broadcast Yourself. v=Cc0pj2tf6_4. I used the machine for about 10 min with two 9V batteries (16.78V on the multimeter). When I took my hands out, they were spastic and I had to slowly open my hands to get them to back to their normal position. I noticed on my left palm (next to my thumb) it was a bit swollen, I think this may be my vein. Has this happened to anyone?