Hi Smellingtheroses,
Sorry to hear that you cancer was not diagnosed until Stage three.
Whilst I cannot fully relate to everything that you have gone through, I can understand how you are feeling about the physical and mental abilities, and how family in particular now act like nothing has happened.
I don't know what your family status is, but I am a single, middle aged women who has never married, never had children and lives alone.
With family (siblings)acting like nothing ever happened, I sometimes find it hard to cope all by myself. Fortunately, I have a handful of good friends to see me though....unfortunately, they all live interstate and their support is mostly by listening to me over the phone.
As you said, this site is very helpful, and the Cancer Council itself also has a number of options for you to explore.
Please keep your chin up and don't let the buggers get you down.
Put yourself first at all times and look after yourself.