I'm Australian so I can offer some guidance on how to proceed within the Australian health care system. I agree with Psychlady in that it sounds like accessing trauma related therapy should be the priority.
Cognitive Behavioral Therapy (CBT) is widely regarded as the gold standard therapy for trauma and I would strongly recommend that you seek out a CBT trained therapist for assistance. CBT is a psychotherapeutic approach that aims to solve problems concerning dysfunctional emotions, behaviors and cognitions through a goal-oriented, systematic procedure. Treatment is technique driven, brief, direct and time-limited (normally 10-12 sessions). CBT is used in individual therapy as well as group settings, and the techniques are often adapted for self-help applications.
CBT is usually offered by Psychologists (although not exclusively) and you can get a referral to a Clinical Psychologist two different ways within Australia:
1) Ask you GP to write out a request for Psychological services. This is a standard procedure, they will complete a form on the spot which you can then take to any Clinical Psychologist who is a registered Medicare provider. You can locate a Medicare provider Psychologist in your area by contacting The Australian Psychological Society. Take a look at the APS locator service here - you can use this to find a Psychologist in your area and if you aren't within driving distance they will also be able to link you with Psychologists who will work over the phone or via the internet. Also, take a look at an article published by the American Psychology Association here. It's an interview with a senior Psychologist and covers some of the things you should consider when you looking for a Psychologist. Medicare subsidizes sessions with a Psychologist in many circumstances, so you may be able to get some help at little to no cost to yourself.
2) If you don't wish to approach your GP you can actually contact the Australian Psychology Society directly and they will organize a referral for you. There is a phone number you can call when you visit the locator service on their website.
I hope this has been of some help. Please let me know if you have further questions or would like me to clarify any part of my answer.