My own petty nag is myself! I'm such a muppet at times. You'd think I'd have the ability to remember I have an allergy which is liable to stop me breathing, really, and that I'd make sure I didn't put the exact thing which causes the problem right behind my own head!
I've spent the past hour and a half wondering why my breathing's going out of the window and my sinuses are feeling blocked. Turns out that for the past five hours I've been lying on a cushion filled with feathers. I've just stuffed it in a cupboard now, shut the door, taken medication and am hoping for the best