I’m gonna have to disagree about it being similar to a flare up, I’m guessing it’s different for everyone, because the initial Herx from a treatment could knock me on my ass (literally could not get off my bed and hallucinating). One thing one of my docs recommended and I found really helped is to drink lemon juice. And when I say lemon juice, I mean squeeze a lemon into a cup of water. If your face isn’t twisted at least 90 degrees from puckering up, it’s too diluted. Bottled lemon juice also works, but sadly not lemonade.