my son is 6yrs old. he is coplaining stomach ache last one month but for time being morning time before going to toilet.he has taken nizonide,metrogyl,o2h pepsiguard,zymino,cyclopalm(prn).vitaminD was insufficient he is taking calshine 60k,and ostocalcium,urine test is normal ultrasound of abdomen is normal.By birth he is having a mildly dilated left lower pole calyx(kidney).please tell me i am very much worried.