Hi Steve,
Welcome to the board! I'm from Melbourne too.
My PN only came on in June last year so I am not an expert and still have no cause diagnosed as yet, for its onset. Have you seen any doctor specifically for your symptoms? Do you have diabetes? Brian, on this board, is from Geelong and has been dealing with PN for awhile.
Anyway welcome and I know people here will help you as much as they can with information as they know your story.
Megan