I know of a fantastic organisaiton called Family Drug Support Australia. They are based in Sydney, but have service nation-wide. There phone number is 02 4782 9222 and there website is http://www.fds.org.au/
There is also Al-Anon (for family members of people in alcohol addiction). Phone is (02) 9570 3400 and website is http://www.al-anon.org/australia/
Nar-anon is for family members of people with drug addictions. Email is serenity@naranon.com.au and website is http://www.naranon.com.au/
On a personal note, I went to a Salvation Army rehab in Sydney called William Booth House. Their telephone number is 02 9212 2322. If anyone is not in Sydney, yo can still call them and get linked to the Slavo's Recovery Services, which do amzing things for people with addictions, and also dual diagnosis (addiction + mental health issues)
I hope this helps, and if anyone would like more information , you can call ARAFMI Helplin on 02 9332 0700.
David