Stop being dramatic for Christ sake. People will still go back to work on the 4th jan.
Nobody is losing their job that quickly. If at all.
Some things will be 8% more pricey, some will be cheaper.
... with an economy that makes income not rise in line with those increases, meaning everyone is 8% poorer.
Including businesses who will go under with that additional burden. Which in turn means job losses. Unemployment will inevitably rise, and with that the child poverty rate will increase, mental health will decline nationally
Add to that the fact we'll now be vastly less competitive on the world stage unless we provide massive tax breaks to compensate for no longer being an EU access point. With those tax breaks, the government needs to make the money back somehow (on top of a pandemic), so expect massive increases to taxes and swathing cuts in public services, with the economy even more skewed to London as the race to the bottom begins. The north will be decimated as a result.
With the border in the Irish Sea, Ireland will push to be united as it simply makes logistical sense now. Scotland, empowered by a failing UK, will push and get another referendum and go it alone.
All of this is foreseeable, even likely, scenarios. Not dramatic.
But we'll have blue passports so it's all sound.
EDIT: Your last sentence; you seem to be making out like it'll balance out.
No, it won't. Huge hit to our GDP, Brexit hurts us far, far more than it does the EU.