Good Afternoon, I Feel Silly For Doing This. I Was

Good Afternoon, I feel silly for doing this. I was recently diagnosed with a UTI (on Friday) and was prescribed antiobiotics. Things have gotten worse and now I have left side back pain. I went to the walk in clinic- who sent me to the ER and no result. They want me to just follow through on the next 4 days of medication. I can barely walk and am in severe pain.