Boiling the pasta removes some of the starches from the pasta, which is why people recommend adding some pasta water into your sauce. Maybe you're allergic to those starches?
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Or, maybe it was an overload you weren't used to. Definetly think the starch is the issue.
I did wonder if starch might have something to do with it, because not long before those incidents I had another similar experience when trying to cook fried plantain to go with a steak. I didn't really cook it enough and it was a little too firm, I wasn't the only person who ate it, but I was the only one that got very sick and I had read something about "resistant starch" in plantains making some people sick like that.
I cook and eat pasta a lot though and I often deliberately add starchy pasta water in the sauce too, but I guess maybe that's not quite as much as one gets from the no-boil pasta bake method. Good theory, cheers. I guess in light of that idea, that is a plausible mechanism and that probably means I'll have to continue pre-boiling :(