I was watching a movie "About Time" and I was wondering if getting to live the same moment twice by reversing time could help us talk more fluently? Knowing at which words we get a block. Haha. I completely understand your frustration and I can relate as well. What I do is , I just stop talking. I read, I sleep, I eat but I dont talk. Why is talking such a big issue in our life? People are blabbering out nonsense with full confidence whereas me with something substantial to say have to keep it all in my head. Tragic, isn't it?