No problem, I had to post because your case sounded identical to ours.
You can go to an allergist or even your regular doctor and request IGE tests. Our daughter did not show IGE reaction (immediate/severe) Hers only showed up when we did the ones checking for IGG reaction (slower, chronic inflammation) These tests were through US Biotek. We were working with a naturopathic doctor-no insurance coverage. The tests did show a definite reaction to only those foods and it tested about 96 different foods. I was convinced. We have tested her again and her reaction to wheat has improved, but the egg is still bad. We suspect yeast overgrowth with her and treat using GSE, which has been helpful for her PANDAS symptoms as well.
thank you! my son has had chronic constipation since he was 2. I asked about allergies several times but our pediatrician is not interested in those discussions. I had the same thought as your wife--I am sure it is safe, as they say, and that many kids are on miralax, but it seems like it might be masking something deeper that we have no insight on. With the incredible sensitivity to bacteria and viruses, it doesn't seem that unlikely he would have a sensitivity to foods or environmental factors. Can you just go to an allergist and request the tests?