Writers tell stories better, because they've had more practice, but everyone has a book in them. Yes, that old cliche.
But I enjoyed getting sick, I didn't mind it at all. So in that short amount of time, I did actually go from 121 right back up to 180, which is way too fast obviously. And that resulted in some doctors visits to get things sorted out.
If something is irrational, that means it won't work. It's usually unrealistic.