Can you try other therapists so that you can make a more informed decision as to who seems to be a good fit for you? What she is saying could be true, but even if it is, her approach might not be good for you. Is she young/inexperienced? It seems odd that a therapist would say these things to someone in your state of mind, who has been depressed for 10 years.

I've read that depression will often subside on its own, after a year or two; 10 years is a long time to have to suffer through this. It seems like you should aggressively pursue therapy (if at all possible) since you have been slipping further into a dark place of isolation. I also think that self-loathing and the voices are things that might indicate that psychodynamic therapy could be a better option for you than CBT. I think that CBT therapy can sometimes strengthen a superego (the voices) that is already over compensated for.

The more I think about what she said to you the more I think that she is inexperienced or has limited experience in terms of the types of patients she has treated. Can I ask why you quit taking your medications?