You do realise that many parasites have evolved sophisticated mechanisms of completely avoiding and stealthing themselves from the human immune system? e.g. schistosomes absorb human antigen from your red blood cells and incorporate it into their own bodies, therefore fooling the human immune system into believing that the parasite is not foreign.
Your advice is a dangerous disservice to many people. The ONLY effective way to eradicate many parasitic infections is through taking the correct specific pharmaceuticals for the specific species of parasite from which you are suffering. The difficult part is diagnosing correctly any SPECIFIC parasite species!