One size does not fit all

I went to see this woman for weight loss. She gave me her one-size-fits-all remedy, which left me with severe stomach cramps, unmanageable diarrhea and painful eczema (which I have never had) for a month. I even got an additional consultation with her to try and tell her that she gave me the wrong medication (she eventually acknowledged that), while she insisted on treating be for my "sleep" where I don't have any issues sleeping. She is not interested in listening to her clients.