Looking for hope

I've been in psychodynamic therapy for two years. Throughout that time, my therapist often pointed out how unstable my self-esteem is and how much it depends on external validation. We also worked a lot on the way I perceive other people—often as threats. Long story short, yesterday I was diagnosed with vulnerable narcissism. And now everything has fallen apart.

I feel like a monster. Every single thing I do now feels like narcissistic manipulation. I'm constantly questioning my intentions and wondering if I'm incapable of genuinely caring about other people. I'm also terrified that my partner will reject me. I already told him about the diagnosis, and now I'm scared he'll eventually see me as a terrible person. I guess I'm looking for some reassurance. Has anyone here been diagnosed with vulnerable narcissism and actually made meaningful progress or recovered? What has helped you?

Also, can anyone recommend books, YouTube channels, or other resources that are aimed at people who have NPD, rather than the usual "If you know a narcissist, run!" content? Most of what I find online is written for victims, and while I completely understand why, it's making me feel even more hopeless.