My 84 year old father has had 2 allergy attacks which landed him in the hospital with a breathing tube insert as he could not breath. We know my father is allergic nuts and sesame seeds (although this did not show up on his first allergy test). We went back to the allergist explained that he had this two attacks. The Doctor had a skin test and blood tested done and told us everything came back negative and to avoid sesame seeds. We do not know what to do now. My father is obviously allergic to something and this doctor did give us any suggests on our next steps. Should I call his office and ask for suggestions or try and see another allergist? Thank you