random question

Annette
Last week, one of my coworkers was making a cup of coffee. I don't drink coffee but I like the smell of it when it's brewing. But that day the smell of it made me sick. Then the next day my boss wore the same perfume she always does and when I smelled it, it made me feel sick. She always wears the same perfume and it's never bothered me before. In fact I always thought it was pretty. This week neither smell has bothered me or made me sick, but I thought it was weird when it happened last week. 
Has anyone ever had a smell that they normally liked just all of a sudden make them feel sick?
BTW, I'm not sure I posting this in the right category.