'Herxing' is short for Herxheimer, who was a German doctor a while back -- he figured out that when you treat someone who is ill with medication, the bacteria etc. that are dying from the effects of the medicine release chemicals (potentially toxins) and their ruptured cell membranes etc. into your body, and that can make you feel worse temporarily, for a day or so, usually no more than several days max, until your body mops up the mess and gets rid of it.
If Herx reactions are too strong and make you too ill or uncomfortable, MDs will sometimes advise to back off on doses or meds for a short while, but that should only be done on MD's advice.
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