Are you chewing it or just chopping and washing down with water? I've said before that people who say they used to be able to eat raw garlic and onion....can't now because of parasites upseting their stomach.
I would try to push through.....maybe eating something very light with it....it heals ulcers, candida, parasites. When I first started, it made me nauseaus....now I have no reaction to it except better health.