Did you eat anything that could be improper? Do you have diarrhea? It can be just a gastroenteritis
, which will get better in the next few days. You shoud try to drink tea with sugar and see if your stomach accepts it. If you start getting better and start drinking and then eating without vomiting
, I would not be worried. However, if vomiting persists and you cannot drink and hydrate properlly, you should go to the hospital.