Why does pizza now make me sick?

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When levels of the lactase enzyme are too low, eating something like a bowl of ice cream or a slice of cheesy pizza can cause a number of signs and symptoms, including abdominal cramps, bloating, gas, diarrhea and nausea

DOES IT HAPPEN WITH PIZZA FROM AN DIFFERENT RESTAURANT?

Is it every pizza from the chain, or just a particular restaurant?  They might be using some spoiled ingredients. Try a different pizza joint and see if you have issues. Or if you still like the taste just eat an antacid before meal time and enjoy.

Sure you might have. I did when it comes to things like spaghetti or pasta. I used to eat a lot of it when I was young--then I had surgery and when I recovered, I just couldn't stand it anymore. Tastes do change over time. It's nothing to worry about. If you have nausea when it comes to some foods, just avoid them. 

Probably either gluten or lactose intolerant. You might want to make an appointment with an allergist.

It could be an allergy or a gluten (which is in the pizza crust and possibly other ingredients) intolerance. You would have to speak with your doctor and see if they can test you for allergies.

Intolerances you can test your self on. Take dairy, gluten and what ever else was in the pizza completely out of your diet for a week, then re introduce them. If your stomach gets upset, then it maybe an intolerance. 

possibility  NOT ENOUGH  INFORMATION

  NAUSEA is the  uneasiness  of the stomach  that often comes  before vomiting 

. some things can bring on  the queasy feelings  of nausea

   MOTION can cause NAUSEA  such as a car ride   or even the odors  of gasoline  or car emissions  for some people  ( picking up ones order )

  having a balance issue  or distortion  can cause nausea

PREGNANCY can cause nausea 

  the presentation said  ORDERING  PIZZA  .. not smelling or consumption

Food poisoning may occur when your meal has become contaminated with bacteria or their toxins. Symptoms include nausea, vomiting, and belly pain starting six to twenty-four hours later. ... Did the other people who ate a slice of your pizza also have similar symptoms?

Are you ok with other dairy besides cheese? The reason I am asking is I have recently been diagnosed with lactose intolerance after years of being able to eat dairy, and pizza is one of the things that triggers it due to the cheese.