At Kohl's store, felt fine then sudden stomach ugh/nausea, headache. Need to go to the bathroom, diarrhea. Then my daughter pointed out that we were near a large candle/potpourri/insence/oils section. Got away from there fast.
Usually I don't have trouble in Kohls as I do with most stores. Even the fabric dyes and chemical fabric treatments can make me sick in some places.
There is nothing to do except try to avoid offending substances.