First, I want to say how very sorry I am for the diagnosis. I'm glad that you have a large family to deal with this. The more support, the better. And a fully stocked freezer is a great help.
There is no way that a cancer diagnosis doesn't cause fear. To me, fear makes me more cautious, even though in the early stages, one might act irrationally. Eventually I become calm enough to think everything through and to deal with it. Recently, I had to make some huge, life-altering decisions. It was scary at first, but I'm well on my way now.