Any chance you checked the ingredients in the generic version?

It should start to fade at the edges. Should not get worse.

Try giving Dr. Frye a call and an emailed photo. Being Christmas is coming and their office will likely be closed for the weekend and the holiday, I'd call him today to get the meds in mail today so you can get it by Friday or Saturday.

I would treat the plants with a very mild diluted bleach dip followed by a thorough rinse.