What's the difference in mechanism between regular vomiting and precipitate vomiting?

I was wondering what the difference in mechanism is between nausea to vomiting and precipitate vomiting (vomiting without warning, i.e. experiencing something gross). I have never experienced it, and I don't know if the whole retching and expulsion happen like regular vomiting, or if you go right to the vomiting stage without the retching and all of that. I was also wondering if the gag reflex always occurs before vomiting.

I know they're odd questions, but I'm borderline emetophobic and these came to mind earlier. I haven't vomited in 8 years, so it's hard to be knowledgable on this stuff, and prefer not to purposely experience it.

Thanks.

Vomiting is ordinarily preceded by nausea. It is not unheard of for a person to vomit without feeling nauseated, particularly in cases of sudden injury or sudden shock, such as witnessing an awful sight or breathing a particularly noxious smell. Vomiting that occurs suddenly and without warning is called precipitate vomiting. But most people experience nausea for a period of time before they vomit.
The gag reflex does not always occur before vomiting - precipitate vomiting is an example.

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