I hate sitting zazen when I'm anxious. Near the top of "most uncomfortable meditation periods" list.
Instead I sat down, awaiting the racing of my heart, heard the bell ring 3 times, then silence, and a chorus of frogs reminding me something I love about springtime zazen! My mind settled swiftly and softly, occasional bursts of anxiety creeping in during the first sit, but then the frogs would sing again and I'd feel myself smile inside. By the time the second sit came I felt like I was in my body instead of my anxiety.
Outside the zendo
A choir of frogs is singing,
"Wake up! Wake up now!"