Swelling and edema after a Liver Flush usually mean that you are low in electrolytes (minerals) especially magnesium and potassium. Products that address intracellular mineral balance are what is needed.
Did you use Epsom Salts ? A while ago I used some for a flush and my face bloated up like a balloon. Getting your minerals balanced, staying away from table salt and taking care of the Kidneys should stop this from happening.