I'm a life long stutterer and understand your anxiety. I've worked in the biomedical field for over 35 years and have been refused several positions over the years regardless of my credentials, But I always seem to land on my feet so please stay positive, And those who commented that mentioning your disfluency upfront can help reduce the anxiety and I've noticed the employer sometimes shows compassion and understanding. And for those of us who sit in meetings and listen to the coworkers who are so full of shit but can ramble on endlessly and sound informed...I just...sigh. Best of luck in your job hunt, it always works out.