Playing and replaying is common with PTSD, and at times even feeling like something was happening all over. What you are feeling is perfectly normal for PTSD. For me part of replaying things was to search for meaning...why...why did this happen...what caused it...what could I have done...why did they do that to me. One thing I've learned is that some times the answers will never be found, but that the present can be lived, and the future made better.