Can 12 step groups be harmful?

I have depression and extremely low self-esteem, also bipolar/borderline/complex ptsd. I know that my thinking is twisted much of the time. To help with my initial symptoms I turned to alcohol. Needless to say I am an alcoholic.(Sober at the moment). I realise that I have built up numerous psychological defenses to deal with my emotions and to have a sense of `self` even though it is not a good one. NB: I was already diagnosed with depression/panic before I abused alcohol. I went to GROW (12 step mental health group) they told me I was sick because I hadn't been baptised. Needless to say that I went completely psychotic for nearly a year. It resulted in me losing trust in religion. After that I began to drink. Now I am always told to go to AA, which I have done - I already hate myself, they say that I am not mentally ill, just alcoholic, incapable of honesty, full of defects of character, arrogant, selfish, self-pitying etc. I recognise that I can be all of those things, but try to be honest as best I can. They say I have a disease, then blame me for it. There are reasons I am the way I am, they don't know my childhood. I feel judged by AA. So has anyone else been through this? I am frightened of going psychotic again. In AA's words, `that I am constitutionally incapable of being honest, I was born this way unfortunate'