Along the lines of what Cheetah said, here is the way a lot of us on US chat boards advise prospective pilots wondering about medical problems:
Find a local AME, preferably one with lots of Class I experience, make an appointment for a medical consultation and present the matter to him/her for his evaluation/opinion. Do NOT request an actual medical certification, and do NOT start to fill in the application form.
Once you have his opinion, for which you paid him, you are in a better position to decide on your investment in training.
It seems likely a similar plan would work in Oz, but of that I am not certain.