Last time was 3 weeks ago with a bad migraine. Before that, I was on a 6 year streak, with the previous occasion involving a dodgy bottle of Sambuca
What I find is that I go through phases where I'm sick a lot then a dry period. Once I start, I find it hard to stop, too, so I have to leave the loo and try to hold it in so it stops.
I must admit, unpleasant as it is, sometimes you need a good puke 