My first bt of advice would be to contact centrelink about your entitlements and also child support if you havent already done so. even if things take time to process, you will be back paid from they date you first contacted.

i would get all your bills etc into payment plans, and also try to buy extra groceries on special when possible etc. i always feel better knowing i have extras in my pantry, instead of 'running out' of things.. its a pet hate i have, and im always known to have 2 or 3 of everything!