I am 21.5 years old female. Weight 46kg. Height 5'3" I am suffering from urine problems from about 3-4 months. But from one months. It is very severe. I feel urge to urinate soon after urinating. Nocturia is there. I can not even sleep because of repeated urges to urinate. I even urinate full quantity of urine even if it is just 2 minutes later than last micturition. Sometimes onset of micturition is delayed. It becomes difficult. I experience lower back pain after urination. And hypogastric region is swollen and painful to touch. Urine contains little to large foam most of times. I had given urine culture and analysis to diagnose the cause. Urine culture report is ok. No bacterial growth But in urine analysis. Rare pus cells are present. And calcium oxalate crystals are there. What can be diagnosed now? What should I do?