Hello and hope you are doing well.
Your persisting symptoms of abdominal pain, nausea and vomiting could indicate a viral gastroenteritis. The other causes could be jaundice if there is yellowish discoloration of skin, food poisoning if the symptoms occurred shortly after taking food, peptic ulcer disease and sometimes cholecystitis and pancreatitis. Please consult your primary care physician for further evaluation. In the meantime take oral fluids and include plenty of yogurt in your diet.
Hope this helped and do keep us posted.
If the pain is concentrated on the right under the ribs and radiates up and into the back it could be gall bladder,you will need a hida scan Dont eat high fat meals there are some foods will trigger it lemon juice will help soothe , dont eat late ,several hours before bed .some folks have an attack then no more with others it continues so get it checked out ...good luck