Uti symptoms but negative test results

It was around a month ago where I tested positive for strep b uti. My symptoms where itching inside urethra, sore to pee, blood when I wipe, urine smelled, low back pain and burning during and after urination. So they prescribed me amoxicillin for 7 days. I’m still getting symptoms, sore urination, feels sore and achy inside urethra, still really itchy inside and low back pain. Keep testing negative. I can’t sleep or go to the toliet properly. I’ve already tested negative for vaginal infections.