12 month shot reactions

My son just got his 12 month shots this morning at 11AM. We went home and he didn't want to eat lunch. He threw up at 2:00pm then took a nap at 2:30pm and woke up vomiting again at 4:00. Then he looked better and we went outside to get some air and he vomited again at 6:00pm. Hardly anything is coming up he's just dry heaving.