In fact, I've just had a light bulb go off, I know what it is that's so odd (or at least part of it), my mind isn't letting me feel the emotion of it. That's the vividness that's suddenly gone. With the emotion goes a lot of detail too. I know certain things, I can mildly picture them in my mind, but I have a habit of procrastinating about my past to myself, and the emotion getting to me. That's not happening, it's just blank.