I dont know any GP's in Melbourne (Im in Bendigo) but I do know that myself and at least one other person here recieved great care for HG at the Royal Women's in Carlton. Would it be possible for you to get an appointment there with an OB? Im pretty sure they do free clinics.
Mum to an angel baby, May 2007 @15 weeks
And Tex born 28th August 2008 9lb 6oz
And.... its another boy!
Jethro born 9th June 2011 9lb 7oz