dear user about your question i would like to tell you that these symptoms refer to having urinary tract infection..........urinary tract infection may be due to viral or bacterial infection......... viral infection always that aquired by sexual contact.......you did urine analysis and the results lead to bacterial infection suggestion.......you need to do urine culture as primary investigative test of bacterial infection as in this case you should have antibiotics for treatment ......... urine culture and antibiotic sensitivity test will detect simply the way of treatment and selection of the approbriate antibiotic that will give best results with bacteria detected......you may not comlete the course of treatment so bacteria not eradicated......discuss with your doctor to do urine culture and antibiotic sensitivity test as it will help alot.....so no worry of flank pain you feel if you follow this..... you should drink alot of fluids and avoid your sexual activity untill treatment completed........ wish you healthy life