Achey Breaky Stomach

We were in Pakistan for just four days, but my dad still managed to get sick while there. 
He ate something that obviously didn't agree with him at my cousin's wedding function, and got so ill he had to be taken to  emergency and get admitted. Thankfully he did come home after a few hours, but had to be hooked up to an IV even at home.
Because of his condition my dad even missed the reception from the groom's side the next day. He had us all extremely worried and we were relieved to see him gain back his strength little by little. 
Now that we're back home, he's still recovering, but there's something I asked him throughout his ordeal.
"WHY in the world did you NEED to eat that?", was my question regarding his erroneous food choice.
Every few hours I'd moan and ask him the above question.
Soon after our trip came to an end, and while we were checked in at the airport, I felt a sharp pain in my stomach.
More pain, and stomach rumbling later, it became obvious I'd eaten something that was causing my discomfort.
My sister's stomach ached too, but my condition was far worse.
"I was trying to tell you not to eat that pizza, but you were so busy you didn't even look at me. Not only that, but you went ahead and took some more," my mom said in an annoyed tone.
"Why did you eat it? You know things from bakeries aren't always clean, especially dairy. You should have had enough common sense not to have touched that!"
I moaned and protested that I had some takeaway pizza from a place a day ago and nothing had happened, so it didn't strike me to be careful. 
The rest of the time all I said was, "It was the cheese, it was the cheese," as well as writhe in pain.
It has been a few days since we have been back now, but my stomach has still not settled down. Last night I stayed awake late because of the pain, and finally agreed to take some medicine this morning.
My dad makes sure I drink some of his ORS from time to time, so I don't get dehydrated and fall down or something. 
He hasn't once asked me why I had to scoff down not one but two slices loaded with cheese of unknown origins.
I guess that makes us even then, because since that day, I haven't complained about why he had to dig into whatever it was that made him sick.