I'm going though the same situation. Ever since I moved to another office and stuttered like crazy in front of my co-workers, my confidece took a dive and I'm having trouble finding the courage to do things I previously did without any issue (going on dates, speaking to strangers, etc.), and my stutter worsened as a result. I'm feeling lost again and it's slowly affecting my mental health, although I'm trying my best to persevere. I actually traveled to Rome for a concert all by myself recently, and I'm proud of stepping out of my comfort zone once more. Setbacks will happen, and it's during times like these that we must be strong and, most of all, have a shoulder to lean on for emotional support. Keep on keeping on.