Horrible nagging feeling.

You know, like, that really horrible nagging feeling you sometimes get for no reason at all? It settles like a layer of ash over that acutely sensitive part of your chest, somewhere near your heart, somewhere near your ribs. It will be there all day and sometimes you won't notice it, you'll just carry on with a vague awareness that something is off and not quite right. When you do pick up on it it intensifies and your heart rate quickens and your breath shortens like a panicky feeling that has no real cause, it's just there. You could be walking down the steps to the library, say, on your way to find some books and for absolutely no reason at all you feel as if you're about to cry. You'll try and get on with your tasks and your chores for that day but for the whole of it there's a distraction; there's a really overwhelming feeling that you just want to get into bed and maybe be cuddled and maybe eat chocolate and maybe not think about anything else at all.

It's a feeling I can never quite put my finger on, but sometimes it's just there.