My stutter is mostly blocking, but I do get some repetition from time to time. I find that blocking is the worst form, since it causes the most stress to me. But when you think about it, it's the easiest to hide. I try and disguise it as a pause for thought sometimes, and it works. Don't get me wrong, I hate my stutter and would do anything to get rid of it, but there is no cure. Be positive about it, because being as negative as you are is not healthy at all.