I start to get a fever & sweats about an hour after I've consumed the food. If it is a small amount they've usually gone about an hour after I've finished throwing up, which can take anywhere from 2 - 6 hours. If it is a large amount then I can still be ill & feverish for a day or so and it hits within 30 mins.

For me it is a reaction akin to food poisoning.

I'd probably get your DS checked out by the Dr to be on the safe side.