Hey Naomi,
I am making a big leap in even mentioning this (and hopefully you won't see a repeat so this will all be a moot point!). But I believe that small focal seizures could possibly cause what you are seeing. I don't know a whole lot about them, but I think you can have a brief episode of abnormal behavior such as twitching or tremoring followed by vomiting and/or diarrhea.
The reason why this has stuck in my head is because my Peg went through months of unexplained vomiting episodes before we witnessed her having a grand mal seizure. We'd not infrequently get up in the morning to find multiple spots of spit-up around the house that had happened during the night. We could never figure out what was going on because she otherwise seemed perfectly OK. But then we saw the first actual seizure, followed by vomiting and diarrhea. We still don't know for certain about those nightly spit-up episodes -- whether or not they were precursors or related in any way. But the interesting thing is that they totally stopped once we started her phenobarb. So I do now think that they had to be somehow related neurologically.
As I say, this probably has nothing to do with Oz and I feel creepy about writing anything that would sound scary. But since you are asking, I felt obligated to throw it out there in case Oz's episodes continue. :o
Marianne

