I have an active support group. Those that want to get better can do so by using the entire treatment approach. It is not their fault - they didn't cause it and they have been powerless to stop it. Until the proper medication came along they had essentially no chance to recover - even with counseling. The borderline is desperate for relief, and often finds it in drugs and endorphan releasing behaviors such as reckless driving, binge eating and binge spending.
Psychosis develops from even mild stress, dysphoria, fear of abandonment, and emotional pain.
It can be severe, and is frequently destructive. It is often associated with symptoms of temporal lobe epilepsy. This involves psychological counseling and other techniques to develop a healthy self-esteem and better psychological defense mechanisms. Borderlines think like borderlines - they've spent their entire live with instability and pain. Aggressively retraining with motivational books and tapes works - if the patient will do it.