Did you notice headaches or dizziness when you did the first round of parasite cleanses? If so, that would indicate the parasite cleanse - which I would suspect at any rate, given a choice of the cause being either the parastite cleanse or the ionic silver solution made by Sovereign Silver.
I hesitate to point at the silver, though you certainly could get a Herxheimer effect of feeling worse before feeling better with silver. A goodly amount of a superior colloidal silver, and Sovereign Silver is neither colloidal nor superior, will frequently cause you to feel a bit listless and sleepy- but that is a good thing, a sign of healing.
With Sovereign Silver at only a teaspoon three times a day I doubt that it has much effect at all. It is one of the least efficient silver solutions out there - though you see it more than any other product in retail outlets due to an effective outside sales effort that most other companies lack.