omg that's exactly the way I feel! There are some weeks that I speak as fluently as the people I admire the most, and some that I can't finish a single sentence without stuttering. My first memory of really getting annoyed by my stuttering is when I was 14 (I'm 18 now). Since then, I've been trying every single week to figure out what makes me stutter so much in some weeks and what doesn't. I guess I'm going to give up because it has been so much effort put on trying to realize the cause of it, but no clue yet of what it is.