I found myself in a similar situation. Whenever I used, my stutter was practically nonexistent. My stutter gets much worse when I'm under stress and have anxiety. Getting clean was really difficult for the obvious reasons but also because of how AA is structured. Having to introduce yourself EVERY TIME you wanted to speak?! Or having to read the How It Works portion of the big book. It's was torture. I felt like my stutter was hindering me from being able to really throw myself into the program. My mind was more occupied about what I was physically able to stay and what I couldn't. I'm so sorry you have had to deal with addiction.