I had food poisoning twice during my senior year at high school and from eating a McDonald's.
I had a club sandwich for lunch along with some salad and I felt fine for a while. But it caught up with me as soon as I got home, first it was this huge headache, then all of a sudden I ran to the bathroom vomiting everything I had eaten for the past 2-3days. I puked for about 4 hours until I felt alright enough to go to bed. Slept for about 4 hours then woke up and vomited again. Missed that whole week of school.
At McD's I ate a chicken sandwich and right away I had another headache along with a fever. Soon after I had nausea and diarehha for what felt like forever. I sick for about 2 weeks after that and lost 5 lbs.