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.