Just called the doctors because I still feel rotten after 3 days of antibiotics to be told that I…

Just called the doctors because I still feel rotten after 3 days of antibiotics to be told that I don't even have a UTI. When I asked why no one had called me to tell me to stop taking unnecessary meds she just said oh I don't know. I don't want to be taking unnecessary meds & I need to figure out what's going on. I feel crap!