DS9 had encopresis and it took us and our pediatrician nearly a year to diagnose. It was an extremely stressful time for our entire family and we went through anger, dissapointment, and confusion as to why our extremely bright 8 year old was suddenly having "accidents". All is well now, but I remember the feelings well. Good luck, it took us a while to realize he wasn't being lazy or unconcerned, he truly had no control over it.