Hi,  I am interested in your post.  There is an interesting paper by Prof. Eric Jackson (NYU), “Adults who stutter do not stutter during private speech”, Journal of Fluency Disorders 70(2021) p. 105878.  In his study, he convinced people who stutter that their speech would not be heard. Under those conditions, all of his 24 subjects were completely fluent.    So my question to you is:  if you can find a place where you really know that you are completely alone, if you then take out a book and start reading aloud, are you fluent?    Irrespective of what your answer is, best of luck to you going forward! I have read some of the stuttering literature, but I don't recall any reports of people becoming more fluent when they drink caffeine. Stuttering is such a weird thing.