Have you ever had a thought pop into your head, something you have been trying your hardest not to think about, and it takes your breath away. It's like someone is telling you bad news and it your left there with no air in your lungs.

It has been happening to me all day.

Only thing is , is that each time it happens I don't know what thought is popping into my head. It could be the most random thing in the world, and it just sets me off, leaving gasping for air.