Colon cleansing will definitely flush deceased parasites (I've seen a few!). However, If they are still kicking, you are doing the wrong parasite treatment!! That is the way to rid yourself of liver flukes.
My naturopath gives me a homeopathic liquid remedy specifically for liver flukes. You take drops in water I believe half hour before meals. The idea is that the flukes are waiting for food. If they receive the drops before a meal they jump on that... and that croaks 'em!
If I were you I would be looking for a natural health professional who knows how to treat parasites to help me with my game plan.