Family Ill After Pizza - Little Caesars Pizza, Windsor Ontario

Windsor, Ontario, Canada

My boyfriend bought pizza after work around 6, we ate it. I started feeling dizzy 2 hours later. After 4 hours from initial eating time, I started vomitting and having severe pain. ( this happens a lot with them and dominos here, from my family's experience)
I went to the hospital. Came out yesterday, my boyfriend started feeling sick 12 hours later approximately. He came back from work this morning vomitting and having diarrhea. My sister and her boyfriend also ate from the same pizza place one hour after us. They were also severely sick at the same time. | Symptoms: Nausea, Diarrhea, Vomiting, Stomach Pain