I stupidly gave DS 15 months a tiny bit of walnut today which he spat out immediately. within 10 minutes he started to go blotchy and red and his face puffed up. I gave him some piriton which calmed it down slightly and then took him to the hospital. He is to be referred for allergy testing. He has been exposed to nuts in food though i have never given him a peanut or any other nut before directly. i feel really awful and guilty because of what I did. Did i give him the nut allergy by giving it to him so young? And what should I do now?