Well I'm not saying I have a parasitic infection but I CAN tell you the exact moment I became sick in August of '06 and still remain sick to this day. I had fever and stomach distress that never went away.
This website you have posted seems to be mostly concerned with people thinking they have things crawling on their skin, which does happen with drug abusers.
It doesn't say much about people like myself, that have unusual onset of stomach distress and exhaustion.