I sleep very well Sinkov.

Because I am retired I will be minimally affected by Brexit. I don't have to worry about setting up trade deals like I used to.
I actually DO worry about my country though. And I am certain that we have made a monumental mistake, which will affect us in many ways.

Yes, of course we will still deal with European companies - but only on the EU's terms.

There will be tariffs which will affect both sides, and we will still have to obey the EU regulations if we wish to sell to them.
Britain will certainly not be as attractive a country to do trade with in the future. Why would they buy British stuff if there is an alternative in another EU country which is not subjected to tariffs, border checks etc?

I agree with BT that one of our better national traits is that, in times of challenge, we pull together for the nations good. But these times of challenge inevitable mean that we become poorer as a nation (the world wars for instance). These were necessary times of hardship that were generally not chosen by us. Leaving the EU is a self inflicted wound.
But don't worry BT, it will not be the rich and powerful that will suffer. As usual, it will be ordinary people like us.

Keep calm and carry on.