Both my DC decided to taste some peanuts and cashews that DH was cooking with. They had about a quarter of each type each. They both immediately complained of a sore mouth/tongue and acted a bit panicky.
DS2 came out in a blotchy slightly raised red rash round his mouth and on his cheeks, it went away when we gave Piriton.
We gave DS1 Piriton too and he said his mouth felt better. Shortly after he complained of feeling sick and vomited copiously.
They are both ok now and fast asleep.
Would it be overreacting to see the GP about this?
I'm sleep deprived with a 2 month old here so any advice welcome. Coherent thought is not my string point right now 
We've not avoided nuts at all in the past, but they've probably only had tastes before of curry sauce with nuts etc and we cook with groundnut oil a fair bit. They are quite fussy eaters although getting better and enjoying tasting new things a lot
Were a fairly dust/pollen/feather pillow etc allergic family, I have aSthma and we all have dry skin issues if that's relevant.