If you need more therapy, there's absolutely no shame in that. The shame is on the VA for trying to one-size-fits-all mental health. Twelve sessions wouldn't even be enough for me to even trust the therapist or scratch the surface let alone be done with therapy. If you have a way to access therapy outside the VA, that's probably the way to go although not ideal. I'm sorry you're having to deal with this. You deserve all the help that you need to heal, not breadcrumbs.