Lavandes, one of the lines you posted has really struck a cord with me.
You know, you don't need to be strong for the children.
You think you do. But you don't.
They need to see that it is okay to be upset. It is okay to cry. It is real and that is what adults do.
My children saw me cry copious amounts of tears when their beloved uncle died. We cried together, we cried alone. I hugged them as they cried and when I was crying my DCs brought me tissues.
You are an amazing lady and being strong all the time is hard so you really don't need to do it.
Bottling up your emotions is not always a good thing.
It is good that you talk to your son in Australia, but again talk to him about how you feel and don't just say what you think he wants to hear.
I know that will be hard. But for you own sake you have to grieve too.
Your husband sounds amazing and it is good that he is there and that you have been able to support each other.
There are lots of support groups on the web that you can join if you want outside support. Or keep posting here, people will always be around to listen.