A walk in the park brings tense flare-ups: Back off, you’re too close. Oh really? Then stay home. A loud neighbor, once a fleeting annoyance of urban life, is cause for complaint to the city. Wake at noon, still tired. The city’s can-do resilience has given way to resignation and random tears.
In Queens, Nicole Roderka, 28, knows she must wear a mask outside, fears the anxiety it might bring, and sets it aside. In Brooklyn, Lauren Sellers grinds her teeth at night; there are sores in her mouth from the stress. When a 3-year-old boy in Manhattan’s Inwood section, Eli

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