Min, I had ME as a child.
Before the ME I had lots of signs of toxicity and violent, mainly noctural, nausea was one of them. I'd often wake up vomitting. nothing as sedate as feeling a bit queasy and needing a bucket beside my bed, it would be sudden..... Now remembering that the daytime nausea wasn't nearly as violent. Often I wouldn't have just 1 episode a night but 2 or 3.