“I'm sitting around too much reading/worrying about things mostly out of my control. I'm a serious worrier by nature, and if I don't keep that under control it starts to get to me.”

First, best wishes on your health. Second, it sounds like you could ignore your finances for the rest of your hopefully very long life and die rich. Third, given two above, stop worrying. I’m a big worrier too, and when the world goes to pot, as it currently seems to be doing, I worry about the end of it all. Then I remember that our worst case scenario is our wealth going to zero. In what world is Berkshire going to zero? Capitalism, or the world itself, would have to end. Capitalism ending might be good for all of us in the long run. The world ending … not so much.

Even if we have a market crash or hyperinflation, or both, Berkshire will still be transporting goods across the country, generating essential power, servicing the backbone of industry, providing essential goods, and insuring it all. And since it has no debt it will be among the few companies standing in the wake of the manifestation of our worst economic fears.

Bottom line is that baring the end of the world, you’ll be fine. I agree with others that you should be giving it (in the form of stock transfers) to your kids and to your favorite charities now, and spend it on what brings you and your wife joy. You are among the very lucky few.