Your Schistosomiasis (aka Bilharzia) is caused by several species of Trematodes that can infect the entire body via the eggs of Blood Flukes:
Schistosoma haematobium
Schistosoma mansoni
Schistosoma japonicum
Schistosoma mekongi
Schistosoma intercalatum
Doctors usually rely on medical drug guides & prescribe only a 1-2 day treatment with Biltricide (Praziquantel).
However, this short-term, low-dose, hit-and-miss method has a high failure rate. IMHO, this wouldn't kill a piss ant let alone an entire colony of flukes! (lol)
Since Biltricide (Praziquantel) has helped you, suggest you review the Fluke Drug Protocol, which combines Praziquantel & Albendazole & treats your infection systemically: http://curezone.com/forums/fm.asp?i=1667673#i.