Did you do the master cleanse? Dr. clark claims that you should do the parasite cleanse before the liver cleanse because you can get sick if you don't. When you do the master cleanse, you also do the parasite cleanse at the same time.
Don't give up, I noticed while doing some cleanses, you can feel sick. Dying parasites and your immune system concentrating on different things sometimes makes you feel sick when your body is healing you.