Hi JS, and welcome!
You haven't failed; the system has failed you - badly. For one thing I can't understand how your diagnosis fits in with hearing voices. BPD, PTSD, anxiety and depression lack this important symptom, so there seems to be more going on. A few questions: Are you female? What medications have you been given? Were the acute crisis team involved because of your attempts at ending your life, the voices or both?
Please don't feel all alone. Lots of us here have been through what you're going through. x