@kzeiss I'm so sorry to hear about your son's pain as it is presenting. Just my humble opinion here, but it sounds like they didn't do all they can for him, at the ER. Has he been in contact with his dialysis clinic, and doctor? This can be an emergency, with long reaching effects. What did the sample of his PD fluid show? Does he have any issues with bowel movements, or the color of his stool? Is there a possibility the PD catheter is causing an issue?
Ginger