hmmm, I never took Colozan so dont know . Also, I wonder why you'd feel pain in an organ if a parasite doesnt like the herb your taking.
It could be that the pain you feel is from the parasite letting go of the organ tissue in there- That can cause a dull pain. It is a good thing and would show that the herbs are working. I've not felt this, but I recall Jozefine mentioning she would feel a dull pain in her womb area after taking parasite cleanseing herbs. She studied medicine and comes from a family whose careers are in medicine, so she knew it was dying parasites.
I would like to see someone more knowledgeable on this give you a better answer-- Hang in there and repost this in the Barefoot Herbalist forum also- as well as the Ask Andreas Forum .