I have been having the worst back pain where my kidneys are and my bladder area for almost a week. The doctors did ex rays and ultrasounds, and it came back normal. My thought was I cant have this much pain for nothing note that I'm only 13 too. My doctor is scheduling a CT scan and to be honest I'm scared. please pray that the doctors will figure out what this is and if it is bad that they will do their best to fix whatever is going on.