I had same exact situations for years - only became fluent when emotionally venting about my dysfluency. Do not over analyze it. You are blocking *because* you are trying to avoid stuttering. You are fluent when venting *because you are no longer trying to hide it*. Period. End of story. I can tell you what I did. It cost nothing and involved tons of hard work. Are you willing to wake up tomorrow and tell 5 sttangers you stutter?