Have you seen this post on the parasites forum? It's from the curezone member North:
This is a really excellent site maintained by a woman who suffered with IBS caused by the parasites B. Hominis and D. fragilis for years, then was mostly cured when she took specific treatments that targeted these two parasites. She lists the treatments that worked (they are Rx, unfortunately, but nothing else worked), and she lists everything that DIDNT work, for comparison. The site doesn't sell anything - it is just unbiased info feedback from people who had these parasites.