About three weeks ago, I ate something and got what I believe to be food poisoning. I got a headache, nausea, vomitting, and cold sweats. I went to bed and woke up the next morning feeling better. The same thing happened recently, the exact same symptoms. I went to bed and it went away when I woke up. My question: What is the problem? Is there some kind of vitamin that I need to be taking? Or maybe something else? Any advice will be greatly appreciated. Thank you.