In the Chicagoland area, and I'm certain Melbourne must have something similar, you can dial an emergency number (911) for any emergency including suicide and they will send the police and/or someone with a social services background out to intervene. Please do us a favor and get this number ahead of time and post it all over your house. It'll be a constant reminder to you that you have another option. Consciously you may want to end it all, but your subconscious/Superconscious mind, triggered by these reminders, may intervene.
My heart goes out to you (and Mokandi for the grief that she is going through as well).
With Lovingkindness (metta),