Dear Molly001,
First, you are amazing. Second, you don't need 'evidence', your words, your story are the evidence. Family violence has a wide legal definition, and includes verbal, psychological, emotional and financial abuse, not just physical. Somewhere in your area will be a community legal service who will be able to link you to what you might need. Your local council will be able to tell you about it.
Also, and I don't know if this is useful, but in Victoria there's:
http://www.womenslegal.org.au/ If you're not in Vic, there is likely to be something similar in your state. They will do free advice over the phone! With an actual solicitor!
All the best to you.