A harsh reminder

Last night was a harsh reminder of how fragile life can be, and how thankful I should be for the 'ordinary'. Right after dinner, Danny started having a few red spots on his face, nothing unusual for this allergy-prone kid. After 10 mins, more spots on his neck, and his ears went bright red and were extremely irritable. Hmm, maybe some antihistamine should fix that, I only give it when he's really miserable. One dose, and redness is getting to his mouth, swelling developing around the eyes, inside joints...okay maybe i didn't give enough medecine, here's another dose, now go to bed and get some rest, you'll be fine Danny.
15mins later, he comes back this time his face doesn't look good at all, he can't kep still for all the itching, i'm starting to panic. One last dose of Zyrtec, and this time i'm keeping a very close eye on him, checking his tongue for swelling (none obvious), can u breath, yes mommy.
Finally, about 45 mins since the first sign, there's Vahid, me and my friend Sukriti who happened to be over, getting very worried and decided it was time for the hospital. But wait, he has an Epipen, shouldn't i be using that now? After a frantic search in a very panicky state of mind, i finally found it in the fridge, where its supposed to be anyway.
By now Danny is not his usual bouncy self and has slowed down a bit, still getting worse.
Quick, get this adrenalin into him. How? never done this before.... Easier than i thought, Epipen is as easy to use as a needle gets. Press blunt plastic end into thigh, hear click sound, needle has magically popped out, delivered its life-saving carge, and out in 10secs.
Releif.... Lets go to hospital just in case.
Within a few minutes, swelling subsides, redness dimishes. Life saved.
Whew!
Now to figure out what on earth CAUSED it!!! He IS allergic to quite a few things, but i've been super careful the last 5 years, i THINK i know everything he's allergic to, but apparently not.
I still can't figure it out. So for the second time in his life, it takes a life-threatening event to get a decent referral to an allergist to get tested.
And to think that the night before, Vahid and I were have a big fret session about how slow his reading is compared to his peers, how shy he is at school, the really 'important' stuff u know...