My T, who has PTSD, has said that she still gets emotional flashbacks sometimes, even after 10+ years of her own therapy, and being a T for 25 years. She said she manages them by using her own coping techniques and by talking about them, and where they came from with close friends. She strongly believes close connections with other people can help pull us out of emotional flashbacks as we see that people don't respond in the ways that our brains have been programmed to believe they will. So I don't think they ever fully go away (just as PTSD never fully goes away). But they can be controlled and managed with enough time and practice.