I have many PTSD related anxiety events. Best things I've found are distraction and movement.
First, I do 25 jumping jacks. Then I have some longish prayers I recite which redirects my thinking. Those two things always help. A poem would work if you don't know any prayers. Looking at pretty things or working with my hands helps too.
There is a young woman therapist on YouTube who has great little videos, you might like her. Search for "Therapy in a nutshell" on YouTube. She has a website too, and she also offers paid courses online.