I am concerned that he isn't keeping anything down. He could become dehydrated which could be very dangerous. Also, when he throws up does it ever look like used coffee grinds? If so, that is a sign of a stomach bleed which can be a medical emergency.   He could have a case of food poisoning or stomach flu. Food poisoning is of course concerning and you may need to seek medical attention if he doesn't get better quickly.   While GERD can cause vomiting it is not considered a sign of GERD. What you are describing is more likely to be due to another cause which should be checked by a doctor soon if he's not getting better soon.    Good Luck - Stephanie