Hi K.!
My son was 15 months old the first time i experienced this, and it was terrifying. We spent 8 hours at the hospital while they did a CAT scan and blood tests and hooked him up to all kinds of different machines..... only to tell me "there's nothing wrong with him." I made an appointment with the pediatrician, who referred me to a pediatric neurologist who diagnosed him with Reflexive Anoxic Seizure Disorder.(RAS)
To my understanding, RAS is a non-epileptic seizure disorder. It is often confused with epilepsy, but the medications used to control epilepsy do not work because it is not a brain centered seizure. RAS seizures stem from the Central Nervous System.
Apparently, in a very small percentage of the population, the Central Nervous System is immature at birth. 80% of children diagnosed with RAS outgrow it by the time they are 5, because their Central Nervous System has caught up. Less than 5% continue to deal with it until adulthood.
What usually happens is that the child receives some sort of shock. A dog barked when he wasn't expecting it, he stubbed his toe, the wading pool is too cold, etc..... If the child is already feeling tired, hungry, frustrated, etc, the additional stimulus is too much and the child's Central Nervous System freezes or shuts down for a moment. In a full blown episode (which is my term, I couldn't think of how to describe it) The child will not exhale, will turn purple or blue, will faint, and have a grand- mal seizure. Then the child will recover. He may act tired or disorientated for a little while. Not every episode looks that way. There is not always a seizure and they do not always pass out. The best thing I found was laying my son down in the recovery position. If I did this quick enough at the start of the incident, he did not go into seizure and often did not pass out.
My son is almost six now and had his last episode at 4yrs 8 months. I think he has finally outgrown it, with no apparent side effects.
There is only one group dedicated to research of RAS that I am aware of and they are in England. Recently they added a US chapter. Here is there website: http://stars.org.uk I have emailed with Trudie before and the people there are very helpful and supportive.
Sorry this is so long! What I would do if I were you is get a referral to a pediatric Neurolgist. If he doesn't mention it, ask what he knows about Reflexive Anoxic Seizure disorder. (If he doesn't know about it, he can't tell you if your child has it or not!)
Good luck and feel free to send me a message anytime if there's anything else I can do for you!