I have never heard of a rash causing vomitting. As for the hormonal thing, very slim slim chance it would make you vomit. If it was going to, it woould have by now. I am going through perimenopause, and my hormones are ALL over the place I get nausea from it, but it doesnt make me sick. I am also cranky as hell, lol. Hormonal shifts can make you uncomfortable, but thatd about it.