I've herxed both while increasing a dosage
and when starting a new herb/herbal mixture, and I've read of accounts from other members here who have experienced the same thing. And to be honest, Houttuynia is what I've herxed the hardest with!!
So your more serious reaction to that isn't surprising to me.
Although remember, if you don't herx, it doesn't mean that the herbs aren't working. (
buhnerhealinglyme.com/basics/do-you-have-to-herx/ - I love Buhner's response!! LOL!)
Your body may be able to keep up with the detoxing easier on it is all. From what I've read, a person would have to stay on an herb for a few months (2 - 4) to see if there is any improvement in symptoms, not just seeing if they herx from it.
Don't forget to increase what you do for detoxing while you are dealing with the increased or new symptoms!
That all over achiness can get pretty intense - I sure hope you feel better quickly!!