Said stomach hurt in the morning, said hurt from stomach into chest and throat. no fever... threw up clear liquids. says stomach doesnt hurt now. is resting . what could it be?

Hard to guess: Usually, a doctor can evaluate if nausea symptoms last more than a day or two. Nausea in a teen can be due to many things, such as stomach virus infection, other viral infection (such as flu), some bacterial infections (such as strep throat), food poisoning, acid reflux (heartburn), gastritis (may be H. pylori), gall bladder or liver disease, anxiety, depression, pregnancy, medications, etc...