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First of all, there is a difference between a food allergy and a food intolerance. A food allergy is where something you ate activates the immune system and you will notice things like hives, itching, and swelling. What you have sounds more like a food intolerance and it is something you develop over time. I developed an intolerance to tomatoes after spending my childhood eating lots of tomato products.

Since most intolerances are related to specific chemicals or enzymes, most likely you developed the intolerance to something in the seasoning

It could also have been contaminated meat if they were from the same batch.

On a more vague note, you could have a gallstone which would cause nausea after eating something greasy or fatty like pork meat generally is.

You have two options: You can either go to your doctor and have him figure it out or do some investigative dining and eat each part of the meal that made you sick separately - Eat pork chops with and without the shake and bake, each from different brands, eat separately whatever else you had on the plate, etc. . .