Your drawing is way off the mark. Here is a drawing that more correctly shows the current path.
You say you need 3 milliamps. Have you measured 3mA going into you from your Beck device? If you had you'd know that it is very uncomfortable and even painful. I guarantee you that you aren't using 3mA. I have been doing blood electrification since 1996 to stay healthy and to prove it does no long term damage. I always use .13mA current. Almost all the blood electrifiers I sell have a light come on when that amount is reached. Both I and my clients have had many successes against microbes which wouldn't happen if you are right.