I Thought At First I Had Food Poisoning. But I'm

I thought at first I had food poisoning. But I'm now on the forth day first 2 days I was vommiting now I'm just nauseous all the time. In 4 days all I have eaten is half a salad wrap and little bits of water because it makes me feel super full and nauseous and it sits in my stomach for a very long time likes it's not digesting.