I had 4 days of fluency and self confidence

I had 4 days of fluency and self confidence I have been going to a psychotherapist for 3 months and one of the things we discuss is stuttering. We have noticed that during my sessions, my stutter is 99% gone and my capacity to express myself verbally is completely funcional. This fact has led me to the conclusion that its my stutter is psychological rather than something else. So the things is i left las session feeling quite good and I experienced how I have been more confident and less insecure. Today I got upset about something and I started stuttering again. I do have hope that my sessions Will lead to releasing allá the nada stuff i have in my head and mental health and fluency will Come together. Has anyone experienced something similar?