I think you gotta understand that because there was fear surrounding the word “deductible”, the unprocessed fear will eventually surround the word “theductible” too. I believe most people have a root cause to the first word they ever stuttered on, and lots of the words they stutter on now. That root cause I believe I spent up emotion/unprocessed conflict regarding somebody or something that starts with that letter. You have issues with d’s. I think you should think back to when this started. A very huge relationship we have in our life is our dad (dad starts with d). Do you have some sort of unresolved conflict with your dad?? I’ll tell you where my stuttering started. I began stuttering at around 20 so I guess in my case have the privilege of understanding how I was feeling emotionally during that time. At that time I was feeling very conflicted regarding what type of woman I wanted to find as a romantic partner. I was Christian and looking to only date a Christian woman, but for some reason could never seem to find a Christian woman I was attracted to. However there was this Christian woman in my Bible study at my college, and her name was Mallory. I got the inclination that she liked me romantically, but I didn’t like her. Because of her, my conflicting thoughts surrounding not being able to find a Christian partner I was attracted to sprung up. As well as this small experience opened the door to all sorts of other stress regarding my social life and self-image at that time. I guess it was like the straw that broke the camel’s back, so-to-speak. Anyways, I began stuttering on her name. Then it became all words that began with M. Then that tension provided a space for tension from other areas of my life to keep pouring in. Anyways, my point is thar maybe you have unresolved emotions and the avoidance is just leading to more suppression of those feelings. Look into ways to process that emotion, including journaling, therapy, etc.