Big Question: Is it working?

I've had my Silverado Zapper for a week now.

First time I tried it, I had twitching and feelings of swelling under my skin, and all manner of itches and tingling across my body. Then that stopped.

Now what?

I've been inspecting my stool but there's nothing unusual going on. How do I know that parasites are being killed? Are there supposed to be signs of pathogens emerging?

I'm quite mystified.