I don't know if it is a symptom of PTSD or not but I definitely echo your above statements...I so often just keep quiet to avoid a "possible" reaction only to have someone else say what I was thinking and it be totally fine. I often wish I could turn this second guessing myself off....Starting to do it some with my counselor but usually takes me half the session just to remember that I trust her to keep caring no matter what I say...I guess I just have to keep doing that forever until I remember at first moment.