My daughter is 18 yrs old with back pain mostly left flank radiating to the bladder for about 5-6 yrs. Every episode lasts between 10-20 minutes, immobilizing her, very tender and weak after. She has been on er after this but ultrasound and ct negative by the time that she is. Had Mag 3 renal scan negative but very painful with iv push. Mri lumbar spine neg and kidney function neg. Can not get a diagnosis, what should I do. Which other specialist can I see?