I'm glad you are researching a lot. Hope you find the right combo to heal your body of the diseases. I did a quick search for you. If you put piperazine in the CZ search, you'll find one other post, from 3 ys ago.
I searched on http://www.ask.com,
there's a link for side effects, toxicity, etc. looks like it is a dewormer that veternarians use. Piperazine is also listed as pesticide, listing poisoning, convulsions, shock as side effects, not sure at what dosages, etc, so check it out.
Sorry I can't copy and paste. I mentioned in another post on CZ about Jethro Kloss book called Back to Eden. It has 900 pages and is a paperback. Kloss was herbalist, food scientist and inventor. He lists herbs for worms in his index. He and his family dedicated their lives to try and help people ovecome their diseases, he researched and practiced healing the body naturally.