I Am A Twenty-five Year Old Female Having Sharp Abdominal

I am a twenty-five year old female having sharp abdominal pain accompanied with gas and vomiting. I ate a chicken sandwich from a fast food restaurant and had a coca-cola earlier in the day. Within an hour or two, I began to experience sharp stomach cramps that were so bad, I couldn't stand up straight. I decided to try water but the pain only intensified. After falling asleep for three hours, when I awoke, my pain had eased but once again within an hour, it was back. I vomited soon after and felt much better so I decided to try a piece of toast with water. I ended up having intense stomach pain again. Is it food poisoning or something much more serious?