Try talking off the cuff. Planning what I am going to say allows my brain to prepare to stutter. The most I will do is make an outline. Then you also don't anguish for months like if I catch myself even thinking what I am going to say or how I will say it, I stop myself. I tell myself I will only improvise and deal it with in the moment. Even if it's something small like a drive-thru order or phone call.