Hi.i threw up undigested food i ate 12 hours earlier. i woke up nauseous. could it be food poisoning or gastroparesis(does it come and go) ?

Indigestion: More than likely it was plain indigestion of food in your stomach when you went to bed. We reserve the diagnosis of gastroparesis for chronic difficulties of stomach emptying. Food poisoning is also a possibility but diarrhea usually follows. Your symptoms Either way should resolve without specific treatment but if symptoms persist or worsen, see your physician for evaluation.