Question about stuttering

Question about stuttering I'm reading that stress can't cause a person to begin to stutter, but I have begun to stutter when I end up in stressful situations, like say grocery shopping days before Christmas. It came after I had a mental breakdown in late 2019. It only happens when I'm in places with lots of stress (like the mall during Christmas) but not say... a packed dog show. I have been looking online but can't get a clear answer as to why I begin to stutter in those specific situations when I have never stuttered before in my life. I don't feel it's enough to go to the doctor with either.