Angry, frustrated

I bought meat at Quali Save at the Cosmo City Shopping centre. I did not know the expiry was today until I ate the meat (I don't have sense of smell so I couldn't smell it) but when I ate, I could taste that it's off. How do they put something like that on the shelf. I now have diarrhea because of the meat, I really not happy with that. I've had an allergic reaction to eating the meat now my whole body is itchy