I have all my life had trouble coming up with the next word in a sentence, even though it's something I've said thousands of times before. I'm a language guy too, so it's doubly weird. No matter what I do I never can seem to complete a sentence normally, and others often will finish for me. Usually I will say a word I didn't mean to say, sometimes the word just escapes my mind completely. Is this a condition, or is it something like confidence?