"cloud of anxiety" is correct and usable in written English.
It is an idiom that can be used to convey a sense of overwhelming anxiety. For example, "The cloud of anxiety hanging over the courtroom was oppressive."
Monday passed in the apartment on 18th Avenue, as in the rest of the city, in a cloud of anxiety.
The flurry of activity cast a cloud of anxiety over the holiday season, just as travel was expected to approach pre-Sept.
There is a great cloud of anxiety that has welled up in our lives: anxiety of our own making and of the making of others, for two hands are often required to stir that brew.
In Sittwe's Aung Mingalar quarter, Aye Maung, an English teacher, explained how the 7,000 residents were unable to leave and had lived under a cloud of anxiety since the summer.
A cloud of anxiety has engulfed the Somali-dominated Eastleigh suburb of Nairobi as the residents await the outcome of the standoff at the Westgate shopping mall.
There was the cloud of anxiety that hung over me before every single run, the self-doubt that made breathing difficult even before my runs started.
The clouds of anxiety began to lift.
Despite the astonishing, far-reaching changes that Turkey has undergone in recent years, clouds of anxiety are gathering over the country.
That hundreds of thousands of women around the world will spend this holiday season under dark clouds of anxiety about their health would be bad enough if they had been driven to that predicament by true need.
Sometimes I can almost see a grey cloud of financial anxiety hovering over hospital staff, who struggle to meet the rising costs of living with wages that have declined in value by 10%-14% since 2010.
Whitelaw divided her time between a flat in Hampstead and a cottage in Suffolk, and never quite believed her luck: "When I wake up at dawn, and that grey cloud of work anxiety is there, I only have to get up and open the window to feel so free and happy that I think I'm going to go off pop".
