Why did I get sick from eating pizza?

Now I'm a huge fan of pizza and I came across a great coupon for 40% off, so I decided to order one with my boyfriend. We got cheesesticks too. We each got our own toppings on our side of the pizza. I was only able to eat two slices and two small pieces of the cheesesticks. I've eaten more than half of large pizzas before, so it's not like I overate. Within 30 minutes, I started to cramp. The cramps got worse and worse making me burp a ton. I thought I was just really full and that I needed to digest, but the cramps never went away. It was just a huge stabbing pain in my stomach. My boyfriend had a slice of my toppings and I had a slice of his, so why wouldn't he get sick?



After three hours of pain, I threw up the pizza to make myself feel better. I felt better for an hour until my stomach started feeling horrible again. This time it was less sharp pain and more dull. My stomach started making really loud constant gurgling. I was able to pass out, but it was awful.



I'm scared to eat pizza again.Why did I get sick from eating pizza?
Maybe you are becoming Lactose Intolerance? Does it happen when you eat anything else with milk or cheese product?