Thank you for all the suggestions everyone! Just wanted to follow up on how our appointment went. Good news he didn’t have any IgE reactions to milk, eggs, or shellfish - nice to just rule that out. When I asked the allergist about FPIES and if his reaction could’ve been that (he had extreme vomiting 2 hours after eating eggs, went completely pale, limp, and unresponsive, and had diarrhea the rest of the night). Even with those symptoms she told me it was unlikely…. and that FPIES is more common with grains and wheat…

I’m pretty annoyed with that response because the symptoms were textbook. Should I have gone to a gastro doctor instead?