I'm 13 years old and for the last day I have been throwing up and having terrible diarrhea! What should i do?

I went out to eat at a sports bar and had diarrhea for the next hour. Eventually i stopped and was fine for the rest of the day. Later on that evening I woke up only to sprint to the bathroom and vomit 4 times. I carried on with the night only to throw up 12 more times. The diarrhea from earlier then added to my misfortune. I had some pepmo bismol only to throw it all back up in about 6 minutes. It is now the net morning and im not eating anything for fear up continuing what happed earlier. The diarrhea remains. WHAT SHOULD I DO?