How do you know if you’re gonna throw up?

I used to throw up all the time. If whatever I ate or drank didn’t exactly agree with my body, it’d be going out way quicker than how it went in. And if I wasn’t vomiting it out it’d be coming out the other way as diarrhea. I remember one time where I threw up 7 times in 5 minutes. I was so scared that I was gonna die. Then one time I was very badly hungover and I threw up 5 times. I had this KFC bag next to my bed. I leaned over, put it up to my mouth and everything came out. However fast forward to this year and I haven’t thrown up in 6 to 7 years. And because it’s been so long, I’ve forgotten how to tell if I’m gonna do it. So how do you guys know if you’re gonna throw up.
How do you know if you’re gonna throw up?
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