Hello! Welcome to HCM. You havent mentioned about fever, if any. This can be musculoskeletal pain or due to stone in urinary tract. As the severity suggests & back pain is also there, it is more likely stone related pain. Stone in ureter (tubes connecting kidney & urinary bladder) causes obstruction to urine outflow from kidney to urinary bladder. Smooth muscles in ureter contract excessively to overcome this obstruction by stone & cause severe colicky pain. Temporary treatment to relieve pain includes smooth muscle relaxants & pain killers like drotin, voveran, tamsulosin etc. Many such patients come in my clinic to whom I advise ultrasound abdomen & pelvis, X-ray KUB, renal function tests, urine routine. Treatment is done accordingly. Consult your doctor for medicines. Hope this information is useful. Wish you healthy life. Thanks. Regards.