Hmm this is a tough predicament to be in. I was a sales consultant for many years ironically, now I stutter but I have found work arund that for the most part I can tone down the amount of stuttering I do, but by no means was I suitable for that job. One day an opportunity came and I resigned, my boss of over 10 years didnt even bid me a goodbye he just said "good, because another person wants my job" I understand working in a field where I need to conversate often is not ideal, so I can understand the issues you may be having and how frustrating the simple task of relaying information can be... Have you give much thought into ways around this, where you could do what youre doing without having to be vocally involved, at least not to a massive degree?