I'm glad that you went back to the herbalist, and you are giving it a try. I know that neither herb is toxic, and I've also read that usually the local herbs will work the best of the local parasites, I hope you have good luck with this treatment.
If not, there really are many other things that you can do, there is a lot of material to read about how to get rid of parasites.
Here is my favorite herb site, because it had a lot of studies about what works, and also it has information about interactions between herbs and prescriiption drugs, in case you are taking any.