I like your writing and your right to be angry and despairing about Brexit, as am I. It is a remarkable act of self-inflicted harm by my fellow countrymen and women. But it will not be sustained.
It reflects the success of a small group to win a campaign but, does not mean that this is a permanent change. This sort of thing has happened before, see
You are a long way off the mark in saying that the UK will look to a trade deal with the US as a replacement for engagement with the EU. Even after Brexit, France is still 26 miles from the UK and Europe will remain our most important trading partner.
Also I cannot overstate the regard which the NHS is held in here in the UK. Whilst it is true that private healthcare companies would want to secure a greater part of UK’s £210+ billion annual health spend, this is the most politically charged of all public expenditure, not something that is going to change easily.
I am hugely relieved that the US will soon have a President who will undo the damage of the last four years. While reversing Brexit will take longer, it will happen.
Remember, You can fool some of the people all of the time, and all of the people some of the time, but you can not fool all of the people all of the time.