Have you thought about changing your therapist? No progress is not really acceptable for 16 years of therapy, actually there should be progress after only a few months. I can't imagine being in therapy so long. I was already exhausted after 3 years.There are times I think I am making progress but then something bad will happen and undo it all. I always end up back to square one only with more wounds each time it happens.
Please don't misunderstand, I think that the therapist might be overwhelmed, I don't think you're doing anything wrong.