Are there any people who stutter because of psychological abuse?

Are there any people who stutter because of psychological abuse? I started stuttering around the age of five. I know this because I had watched of home video of when was four and I did not stutter. Stuttering did not bother me much through elementary school. My mother had a severe stutter until I was born and it completely faded away when I was about seven or so. I always thought it was genetic because of that. Until I became aware that I only stuttered when I was worried what people thought of me (all the time) or when I was overly excited. Sometimes I would have a bad week, sometimes I would sound completely normal. Always, though, I would speak clearly when I was alone, with an animal, or not thinking about my stutter. If I just said something without thinking, I wouldn't stutter. It wasn't until I was a teen that I realized this. I still think that maybe I had started because I was copying the way my mother spoke because she was always at home more than my dad. Then it turned into something else because my mother would point out to me that I had her stutter. I then became a stutterer just like her. I went to speech class from kindergarten to senior year in high school. Nothing helped. The speech teacher in high school told me that I would have 80% fluency at the end of every year. I would keep telling her that I'm comfortable speaking around her, but the second I walk out of the room, I wouldn't be able to form a sentence. She never understood. I'm not sure where to add this, but I had experienced psychological abuse from the age of about five to twenty by my mother Physical abuse from I believe five to fourteen by her. Years later, a neuro-psychologist told me that there was nothing biological about my stuttering. I believe him. I'm able to control it a little better now that I know, but it's still really frustrating some days Has anyone else experienced this?