H. Clark's parasite cleanses are usually 18 to 20 days, followed by weekly maintenance doses. Then she advised doing other parasite herbs for different types of parasites. Most people don't see parasites coming out during the treatment, either they are too small to see and/or they are in the body and not in the intestine. She did mention some other herbs to use in her books and there is more information at the parasite Support Forum. If I follow a parasite treatment sometimes I see worms coming out when I follow the treatment with a Liver Flush.
It's possible that you are carrying a type of enteric bacteria that produces toxins and these toxins cause Depression and anxiety. Clark developed a Bowel Program to treat for this and I think Schultze also has some treatments. One of Clark's herbs is the spice, turmeric and there is information online about doses and how to use it. I found this to work quite well.
It is always a good idea if your have digestive problems to have the tests for Celiac Disease. See http://www.celiac.com.