I'm a little late to the conversation, but I can relate to intense self-hate. I do like Walker, but I wanted to add what I remembered van der Kolk saying or at least my interpretation/memory of it. Self-hate aids our survival as a child because it suppresses the needs and feelings that provoke our caretakers' anger, threatening our survival. We learn to hate those behaviors our parents dislike and try to behave in ways that our parents approve of. When we deviate from that, it triggers critical voices whose actual job ultimately is to keep us safe and functioning. But like Walker said, when we don't get our natural needs met, we get angry (he calls it the protest emotion), but when we still don't get our needs met, our true needs and feelings get buried and that same anger is now directed to ourselves and keeps that buried self from resurfacing. The problem is that the buried self contains our authentic needs and feelings. So this causes a conflict in which authentic feelings become tied with feelings of shame, hate, and badness.
When I was in junior high school, I remember one time I caught my reflection on a tv screen, and for a split second, I didn't connect the fact that the image was me right away. For the split second before I realized the image was me, out of the corner of my eye, the image emanated an intense energy of evil and ugliness. I thought "witch!". When I realized the image was a reflection of me, I was horrified.
When I started on the path of healing from ptsd, I remember reading these passages in van der Kolk and Walker and I decided that I was going to embrace my authentic self and I was going to integrate it back into the world of light. I could picture myself as a child bearing the scars of trauma, living in the dark and I imagined her walking into the light and hugging her. For like 7-8 months thereafter, my head was like a constant open wound. I opened up feelings of hate, ugliness, stupidity, awkwardness, etc. etc. that just stayed with me in a nagging way. I just felt crappy all the time. But I told my critical voices that "she" was not going away and that I loved her and wanted her. I did reparenting stuff and did a lot of reading and reflecting during that time. At some point, that constant feeling of shame and hate dissipated. I have not healed completely by any means. But I feel like that was an extremely fruitful process for my healing.