You CAN afford to do this my love and you iwll. It's difficult. It's tough. It will seem some days that life is just too hard - but you will get through. Nobody needs to stay in an unhealthy relationship because of money in this country. You are resourceful and smart - you will find ways. Seek legal advice tomorrow. Contact centrelink and get the ball rolling. Change the locks or move. Do what you need to do & do it with courage and strength - with your head high. The night time behind closed doors or with a trusted friend (or on here) is the time to drop your bundle. It's safe to do that here. You can apply to the PSG if you need more privacy.
I so very well understand where you are - very well & you can make it.