One more sleep until the diagnosis

It's such an overwhelming time @DomThom You don't say where you are but I'm guessing it's somewhere in SA. It does feel like a whirlwind but once you have your diagnosis, you can slow things down a little if you need to.  You say that you're seeing a doctor in Adelaide.  Is that a surgeon? I can thoroughly recommend Jim Kollias if you're looking for one.  For now, just try to take one step at a time, and breathe.  Write down any questions you have for the doctor and take someone you trust with you to the appointment as it's always good to have another pair of ears - you probably won't take in much of what you're told. If finances are an issue, don't be afraid to let the doctor know that - you'd be surprised at how understanding many of them are.
As for the kids, my best advice is to be honest with them. You are in shock.  My kids were 11,12 and 15 when I was diagnosed. We told them what was going on and that I was upset and worried.  We also told them that we would tell them what we knew, when we knew it.  They have been understanding through all of it over the last 9 months.
Let us know how you go.  For me this site has been a sanity saver. You will find information and support as well as the odd laugh from people who get it.
Oh...try "Night Howls" if you you're awake in the middle of the night, or anytime, really.