Just cannot do presentations

Just cannot do presentations Conversationally, I would say that I have a mild stutter. The moment I have to do a presentation my stutter amps up to moderate to severe. Whenever there is a possibility to stutter, I stutter. I always go in with a game plan as to how I'm going to approach the presentation, but everything just goes away when I start talking. The feeling after the presentation is just the worst, like my mind just won't function and cant get anything done for the rest of the day. Wondering if anyone else has this problem or any advice.