I would second Ambersky's suggestion that you see a Women's Health physio. They can assess the scar tissue and determine whether or not it is normal or not for this stage. (I am a physio who has worked in Women's Health, and it doesn't sound normal or acceptable to me - if time was going to be a solution, you'd expect to be a lot better than you are at 4 months.) She may teach you techniques to help to normalise the tissues (massage, stretches, strengthening exercises, techniques to influence blood supply, etc), and therapeutic US may well be useful as well.

You shouldn't need a referral to get in to one, unless you go through the public system. Find one through the APA website (Australian Physiotherapy Association) or the yellow pages, but just make sure they are specialised in Women's Health when you book.