Hi Peta, it's no wonder you are feeling isolated and upset, that is a very short time after surgery to be sent out without much help or assistance. It does seem that some hospitals are better than others at providing good aftercare support, which is pretty unfair.
Were you referred to a breast care nurse? Hopefully they can help to support you through your post-surgery challenges. I found I needed to be pro-active and chase my BC nurses, but they always got back to me within a few days.
One of the things I found really helpful in my physical recovery was attending an Encore Program which is run by the YWCA in all States. It's a free 8 week exercise program (pool & land based) that has been specifically put together by physios etc for women who have had breast cancer surgery and it has improved my mobility and strength both times I have attended (once during treatment in 2013 & recently following reconstruction). Not sure if they have a program running near you (google YWCA Encore to check it out if you're interested). The other benefit was meeting other women and hearing / meeting local service providers that might be of interest. You do have to be at least 8 weeks from surgery to participate, but it might be something worth looking into.
Hope this helps and don't forget, we're always here to listen xx