Annoying UTI

Savannah • I have a cockatoo
Okay so, I have insurance but I don't have a doctor yet .
I went to the ER , they prescribed me Cipro for my uti & then called me and said that they needed to change my medication to Amox tr-k clv. Amox is used to treat UTI that are resistant to antibiotics and caused by e-coli. Well I took the 7 days, I don't feel any different. Still have back pain, and the occasional burn when peeing. Haven't had time to get my doctor, should I go back to the ER? Back pain is keeping me up at night. Advice? Please !