On the tip of your tongue?

  Are you familiar with the feeling of thinking that there is something on your mind, but you don't know what it is? Not a point that had anything to do with something prior, but similar to the feeling you have when you are trying to remember a name or a phrase, and though it is on the tip of your tongue, you just can't bring it into focus? It is a frustrating feeling, that is similar to the one that I am trying to relate to you. Similar, but different!
  Different in that this one has no subject matter at all? Nothing to which you could say, Ah, there it is! These are the kind of thoughts that would be more accurate to call non thoughts, because they have yet to be thought? These are rare thank God, but nonetheless frustrating!
  These are similiar of the ear mark type feelings you have when trying to bring a memory into a clearer focus, that try as you might, you cannot! But this thought, whatever it is, certainly could not be called a memory, because this is a thought that has yet to be thunk? In fact, this would be a totally new thought, if only you could bring it to mind so that you can think of it? Damn it, what is it, where is it, and what is it that refuses to come into mind?