I don't have any answers for you but I feel your pain. My 4.5 year old daughter has constipation issues also and I know how frustrating it can be. She went through a period of 3 or 4 weeks that she did not eat solid foods. Only pediasure and yogurt. During this time she said she hurt in the middle also, pointing to her belly button. When her doctor felt her abdomen he could feel all the stool in her abdomen and said it was all the way over by her appendix (I guess the intestines can stretch quite a lot). He should not have felt it that far over but she was soooo constipated. Maybe that is why your son points to his right side? She did vomit a couple of times too and she was always feeling nauseous. Probably from being so backed up. She is now on the maximum dosage of Miralax every day . If she misses a dose she will get constipated again. Good luck on Monday. Let me know how it goes.