Hi Lyncola,
Yes, Vagifem is prescription only here so probably in Australia too.
You could probably get the Yes products directly from their website, but the cost of postage might be prohibitive. You do have a good one in Australia called Olive & Bee, just olive oil and beeswax so very pure. Have a look on their website as I doubt you would get it in the chemist. That aside, why not try using the Ovestin every night for 2 weeks, you've nothing to lose. If that doesn't work, maybe try another doctor then.
If you are on Facebook, the Vaginal Atrophy Facebook group is a good resource, and there are some Australian ladies on it who may be able to advise on products available to you. It is a private group so you need to answer three questions before you join.
Just a thought, but I sometimes use a little good quality Emu Oil as a moisturiser. Doesn't irritate me at all, but it's all trial and error.
Best wishes,
JP x