[BusterDog]

From another story on the matter:

Johnson’s partner, Carrie Symonds, said in tweets that she “cannot thank our magnificent NHS enough” and that she “will never, ever be able to repay you and I will never stop thanking you.” She admitted there “were times last week that were very dark indeed. My heart goes out to all those in similar situations, worried sick about their loved ones.”

I don't remember hearing anything about the very dark times last week.

[NautiNurse]

There were quotes from Johnson’s family members describing Boris’ condition as 50-50 survival chance, and other quite dire terms.

[BradyLS]

“Dark Times. Dark Times all the way down...”

[Guenevere]

He mentioned it himself in a video this morning....
...he inferred there was a life/death tug for 48 hours