Parasites put off toxins which affect the liver. The liver has to filter out every toxin in the body and it also has to produce 1 and 1/2 quarts of bile everyday for proper digestion. The liver is too busy dealing with toxins to produse bile. This is the cause of the bloat and the constipation.
Toxins can also mess up the hormone balances. I think you are on the right track...parasite cleanse...then maybe a plain liver flush afterwards. The recipe for the liver flush is at the bottom of the Questions & Answers page at http://www.humaworm.com