Urinary Tract Infection =(?

I started having symptoms of a UTI (uncomfortable urination, really bad urge to urinate, smelly urine) on Wednesday night. I went to the doctor on Thursday and gave a urine sample and it came back fine. My doctor told me to drink a lot of cranberry juice and water (which I have) and I'll be fine. Now it's Saturday evening and the urge to urinate is worse, I have pain in my lower back and I've notice some blood in my urine. I called this morning to make an appointment on Monday morning. Does anyone have any suggestions to help my symptoms or any tips to help me feel better? Do you think my UTI has become worse over these past few days? By the way, I've already taken AZO for the maximum amount of 2 days.