Do you have any kind of a reflux disease by any chance? Also do you have any crampy pain besides the burning? Also this may sound gross but do you have any diarrhea with it? You could just have a slight stomach bug where you feel hungry but everything you eat is going to irritate it. I would wait til tomorrow and see how you feel and if you are still miserable and are vomiting I would see a doctor as it could be the start of something more serious such as food poisoning, a reflux disorder, bowel obstruction, gall bladder etc. You can vomit a yellow watery substance for many reasons. My mom had a bowel obstruction about 3 years ago and was vomiting a yellow watery substance but I don't remember if she had any burning in her stomach or not. Again tho if the problem persists definitely see a doctor asap. If it goes away it was probably a mile case of the 24 hour stomach flu.
I have no kind of acid reflux disease to my knowledge. N yes I have a crampy pain with it as well. I am still feeling the crampy pain and the burning but the vomiting has stopped. I am starting to eat but not a lot.