My son has always has a reaction to hummus (although not chickpeas or sesame seeds, we're thinking maybe its the stronger concentration of sesame oil in the tahini), and it always goes away within an hour or two. I agree that you should try the foods individually, but I would also reccomend having and anti-histamine (like benadryl) on hand just in case the reaction is more severe the second time, my sons was. Nothing life threatening but definitely disturbing to me. Good luck.