I'll preface this by saying I haven't read all the posts, but man, have I been there. Too hard. Not their expertise. We don't seem to be making progress. Heard it all.
Yes, go right ahead and be angry. Asking for help is hard. And when you ask and ask and ask and you think you've finally got someoje on your side and then they abandon ship? f*ck that. f*ck the world. What am I fighting for?
Thing is, you don't have to be strong all the time to be a survivor. When you feel hurt, angry, abandoned, alone - you're allowed to stop for a moment and let the feelings come, and then you let them go.
You let them go, ultimately, because "I can't help you" is not the same thing as "You can't be helped". You let the feelings go because there will be someone else, there will be more help to come. And this time, when you go looking for help, you've got all that you've learned so far on your side, and you're that much better at knowing what "help" for you needs to look like.
As for the Borderline thing? Pfft! Show me a victim of child sex abuse that doesn't have Borderline traits! The reason they keep tweaking the criteria for Complex ptsd and Developmental ptsd is because that's what that shite does to you. And the people who really know how to help you, who will understand you, will totally get that when they're helping YOU, they're helping someone who was sexually abused as a child. That's the package they've got before them.
Be gentle with yourself while these emotions wash over you. Go ahead and be angry and disappointed and betrayed...And then go back out there and get the right kind of help for you. You are a survivor, and this is part of the journey, with all the ups and downs that come with it.