Yes to all.
Intrusion is one of the main elements of PTSD that makes it such a beast.
Sometimes it helps to set aside time to dwell on it, and then tell your brain, ok no more today. Sometimes it helps to only distract yourself when the mind wants to stay on the fear and triggers.

You need a T to help you find how best YOU can work through all this.

What you are experiencing is common and "normal" for PTSD. ((((time0)))