Hello my friend. As a person, that has randomly blockages especially with names, I have one advice for you. Stop right now blaming yourself. It is totally normal to feel like that, but you should accept your stutter. I have tried so much to prevent the blockages, but as you Push yourself not to stutter the more stutter will appear. GUYS WE HAVE TO ACCEPT OURSELVES, EVEN WITH THE STUTTERING. NO ONE IS PERFECT. As for your friends don't feel that is your fault. A real friend will accept your stuttering such as you accept their faults. NO ONE IS PERFECT!