The best protocol for deparasiting is Dr. Clark's version of herbs and zapper, from my experience. She talks about a lot of aspects including how it could be toxicity as well. Her emphasis is parasites though.
It's where I started. I'm back to good health again--just some little stuff to go. I'd definitely suggest believing Dr. Clark over any pusher of the pharmaceutical cartel, reputable as they may appear. :)
You can download her book here for free. It's called ' The Cure For All Diseases '. The second link works, but not the first one I've found. It's self-edited, so a bit lacking in a good index, but well worth digging thru. She gets a bit extreme in her clean ups, I think. I say just focus on her deparasting section and work your way thru the other stuff as you start feeling better.