I ended up in the Cardiac unit once from similar heartbeat issues. Mine went from 160 and would drop to 30 in the same minute. Had every EXPENSIVE test in the book and ended up with perfect blood work, save being on the 'low normal' end of potassium.
Up the magnesium and potassium NATURAL suppliments you are taking.
The enemas DEFINITELY are the issue - not so much the herbs.
You'll be fine... I can convert any heart rhythm issues by taking an Epsom Salt cleansing bath and also potassium within one hour.