My two and a half year old boy has frequent nausea and vomiting in the morning. Approximately 3 times a week if he doesn't eat when he first wakes up he will become irritable listless and eventually throw up. Once he has been sick however his mood improves and he starts to eat. I sometime think it correlates with if he has had a good meal the night before or how long he has been awake before he eats. My sister suggested that perhaps it has something to do with his sugar levels. Please advise as I have asked my local MD and he didn't seem to pay much attention to my concerns. This has been going on for about 8 months now.