I've used yarrow, wild that I gather myself in North Carolina mountains, I thinks its a good herb. Maybe this person you went to can help, keep a good attitude, meditate on how these herbs are destroying the sickness. If you don't believe something is going to work it probably won't. On the other hand if you believe something is going to work, it may or may not. Like everything else there is a balance. The ying and yang of it all