Stress can make it come back. I'm 40F and it's come and gone for years at a time. I had speech therapy once in middle school, never again after. I just came off a bad fluency "relapse" that lasted about 6 months during a move 2 states away. Finally, I'm back to my normal amount of stuttering which is so infrequent, someone who doesn't know me intimately wouldn't realize I had a speech issue. So, I recommend some self care and grace. It'll get better again if you take care of yourself and don't add this to your list of worries. Update us though! I'm interested in your experience.