C.C.
My middle child also a boy. Had fairly severe hives that normally appeared 2-3 hrs after dinner. My kids ( younger ones are consistent coughers in winter due to respiratory issues) When he was having the hives. He had a distinctive cough.
We went to 2 local allergies neither were any help. It was actually very frustrating.
With my son hives it would start in late fall and would continue until sometime in the spring. He had the hives the past 2 winters. Hopefully this approaching winter he wont have any.
We now eat only organic tomato sauce. He seemed to have a problem with a few brand name tomato sauces. My sister has a few severe allergic allergies to food.
I give him Benadroyl ( sp wr) this really seems to help. Good luck.