why do i cry again later??

hi i’m not sure if this is the place to ask so i’m sorry if it’s not ☹️

starting with this; i don’t think im allergic because i haven’t ever had a reaction and i LOVE onions. but if i cut onions, ill cry a little like normal and then im fine. i always wash my hands really well too. an hourish later though, it hits me AGAIN even if im in another room. even if i’m not the one who cut them!!!! there have been times where my mom is cooking and i’m UPSTAIRS and it will hit me an hourish after she’s chopped them up. is this a thing or am i nuts? 😭😭