I'm glad your session went well.
Sometimes talking about things like nightmares
and past traumas can bring up your feelings about what you went through, making them very present. That is actually a good sign, though it does not feel very good. It means that you are not repressing your feelings and you are dealing with them just as they are. When you repress your feelings, that is when you start to have bigger issues.
When you mentioned not being able to stand the sight of yourself, it sounds like you might be taking some of the shame and guilt from the attacks and putting them on yourself. What you are feeling is a common reaction for survivors of a trauma and it is part of recovery to work through. It helps to start seeing that thinking this way about yourself hurts you and try to change your thinking. When you feel that way, start saying to yourself that this was not your fault and you are not to blame for what happened to you. It may seem untrue and odd at first, but after a while you will begin to accept it.
Feeling like a zombie with all those feelings coming up may be a defense to dampen them down some. It can be overwhelming to feel a lot of feelings at once and it's normal to back off emotionally. This is not repression but rather just a way to cope. Your therapist is right, writing your feelings out can help you process them better and express them at the same time.
I hope you had a good night and did
get some sleep. And no nightmares, I hope!