My son had a pyeloplasty last april and only has 10% kidney function in left kidney, He complains with his belly hurting most nights before he goes to bed and in morning when he wakes up , he has been sick twice one over thanksgiving and one after christmas . Last f/u with dr he still had some fluid on kidney which was the first part of dec . What the changes it be problems with that kidney again ? What are his chances of having issues since the kidney only has 10% function and wont regain any function back. My son is 7 1/2