Same as you, around Christmas 2020, I was dog rough for about 2/3 weeks, before anything really kicked off, treated it as a cold/flu, but still had to work as our place don't pay sick pay, you can only self cert, you loose your 1st 3 days of sick.
But since then, I've decided to be outside more, even in winter, taking dog out more, fishing, walking, even now yping this I'm sat in garden.
I've had all the relevant jabs, as wife says so with being in the NHS on the frontline.
But (touch wood) nothing really of a cold since then....don't take any vitamins, paracetamol or any painkillers, just keep my fluids up and (try) to eat decently.