Lactose Reaction to Chocolate - Hershey, Riyadh Riyadh Province

Riyadh, Riyadh Province, Saudi Arabia

I ate a Hershey's chocolate randomly, it tasted weird but i checked the expiration date and it was till next year. After an hour or so, my stomach started having reallyy bad. Diarrhea kicked in. Couldn’t sleep the following night. Went to the doctor, he said i got stomach infection from eating something. I only had breakfast the past day which was around 6 hours before i ate the chocolate.
Suspected food poisoning. Symptoms: Diarrhea, Stomach Pain
Suspected source: Im lactose intolerant, definitely chocolate
Onset: Less than 4 hours
Duration: Several days
Sick: Me | Symptoms: Diarrhea, Stomach Pain, Headache