it could possibly be a stone in the ureter. please get a plain CT scan of KUB region. give a sample of urine for culture and sensitivity test as well. To assess the
kidney function, do blood urea and serum
creatinine.
Take Tab. Drolgon twice a day for 5 days
Tab. nexpro 40mg twice a day for 5 days.
Please update the results and we shall suggest you the management