Food poisoning?

Yesterday I started throwing up at 2am and continued until about 2am the next day. I probably threw up about 25 times and I had diarrhea. My body always reacts really violently when I get this type of (what I'm guessing) is food poisoning, and I'll continue to throw up even though all I'm throwing up is bile and stomach acid. Usually the vomiting lasts between 8-14 hours. I'm just trying to figure out what type of food poisoning this is -- that day before I had thrown up, I ate nothing except a couple power bar type bars, and some pieces of cubed cheese I got from the deli section at the grocery store. The day prior to throwing up, I had eaten a bunch of different things because I was at a house party, so I really can't pinpoint what could have made me sick. I don't eat any meat, so I know it doesn't have anything to do with undercooked meat. Anyone have an idea of what type of food poisoning this is?