Megabite
Usually Allergies do indicate a Parasitic infection of some sort. It sounds like the "Bugs" definitely do not like the Herbs. I know I would try to continue taking it and ride it out, unless it's way too unbearable.
Maybe some other cleansing would possibly help beforehand, such as
Liver Flushing if you haven't already done this.
Otherwise you can ask Humaworm on the Forum, or call their phone number. They're pretty helpful, they might have some other ideas.