Question: My son is 5 years old, underweight and has started vomiting in his sleep. He doesn't wake up as this is happening in between 10 pm and 1 am, I wake up to the sound of him choking on his own vomit. After he comes to, he immediately asks for food. By the next day he seems normal, no fever, no complaints or lethargy. It's like he doesn't remember the incident, and he was on the toilet last night, with a bucket between his legs. I screamed and shook him multiple times, tried to listen for a heart beat, and slowly he opened his eyes and his head rolled back. I asked him if he fell asleep, and he said "I almost died". Maybe I'm over reacting but that incident scared me, probably should have taken him to the hospital then. A couple hours later I went to bed with him, and by 10 pm again projectile vomited and choking, but he didn't wake up. I lifted him up and screamed for my husband. He saw his pediatric doctor today, and it was all maybe it's just something running it's course. How does a child only vomit at night, present no symptoms for almost 24 hours , and it continues again. The scary part is that I would think he would wake up with these bouts, instead he chokes on his on vomit and coughs a little. What could cause something like this? Where do I need to go for an answer or how can I politely demand tests, and which ones for his doctor to perform. I know every parent with a child that vomits fells this way, but my intuition says this is not normal or a bug.
He is on methylphenidate 18 mg, and has taken it for 2 years. He also takes clonidine at night to help him sleep, without it he would sleep for a couple of hours, then be up from midnight on. Picky eater refuses food and drinks minimally for the 8 hours on the Concerta. Has a limited diet mainly bratwurst, bacon, sausage, fried chicken and fish sticks. Broccoli, apples, and yogurt are hit or miss, and that is the extant of his palate. Cereal and milk are his main breakfast foods, refuses everything else. Main diet consists of meats and diary products. He has been diagnosed with adhd and autism. He weighs 32 pounds and is 42 inches tall. Highly active, very seldom rests. Thought more medical history may be useful.

Thank you for a clearer direction to proceed. He went to his pediatrician today, and it was clear she thinking viral or something that would run its course. My last question is should we take him to the hospital now, or wait for another episode?