I second what positivo has said and move into the yogurt/kefir, oat bran, buckwheat, and other prebiotics. This is very important as well. Killing parasites is very similar to killing candida except you take different antifungals and the diatomaceous earth.
As far as the liver being a problem, testing doesn’t work completely with anything either and sometimes you have just got to try it out or take a plunge.
I highly recommend trying out acupuncture as well which can help heal your organs and balance the body. Its a cornerstone of my treatment and feel that it can do wonders by itself.
We can come up with all sorts of stuff, there’s always more you can do. After 6 months I wasn’t satisfied either, but between 6-12 months is where I made the most progress. As you get stronger your body can heal itself better; it just might need a helping hand in one way or another.