Are you taking Iodine as well?
Important to not take just one element in high dosages, without the supporting ones.
Magnesium, vit C...etc.
Could be detox of fluoride you are going through, but I doubt it in such a short time.
One symptom I can relate to is dry skin, this happened to me when I was hypo T. Borax aggravated it back then, but now it doesnt anymore. Unless I take a lot / too much
I dont recommend Mule Team internally, the chance of it having inpurities or additives are to big for me.
In most cases it works out well, but I wouldnt do it.