Ooh - have we ever actually filled a thread before
Well done copt - I didn't even notice we were getting to filling point!(love the title - typos and all
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betsey - wishing you loads of luck for your results on Friday, - you and your DH are bound to be feeling a bit fragile atm, - the waiting is horrible.
With regard to explaining things to the children, - I am not much help as mine were older teenagers - but there are plenty of women on here who's DC were similar ages to yours when they were DX, - and I'm sure they will have plenty of tips about how to explain things to them. 
Some people find to much information all at once a bit overwhelming, but I also think it can be very empowering, to know what is what, from reputable websites, NICE, MacMillan etc. (for some Google sites you need your bullshit filter firmly in place though!
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About anger - I do feel some of that, - I had a pretty hefty dose of bad health in my thirties which I felt stole my time with my young DC - and somehow in your head you feel 'right I've had my share' - then along comes the next curve ball!
I used to look at people who have absolutely no health problems and think 'what are you doing that I'm not?' - But of course it's totally random, there is no reason to any of it, so it is fruitless to waste time trying to figure it out. 'Shit happens' is pretty much my philosophy these days. And I have lots of good things in my life to focus on, so am blessed in other ways.
Waving to Sparkle - hope all is well with you, how are your girls settling in to their new home? 