I've been sick at least once every morning for the last week and remember now that this exact same thing happened with my last pregnancy. In fact both pregnancies have gone exactly the same, extremely bad vomiting from the beginning, easing off a bit at 21 weeks, getting a bit worse again, but mainly stabilising, and then coming on intense at 37 weeks till the end. I know there's no good proven reason for bad morning sickness anyway, but this end of pregnancy sickness just seems like a bad joke.
I know there's no cure or anything, but I was just curious about how common it was.