Someone requested that I post the instructions for Square Breathing (sometimes called Four-Square Breathing), the technique that is helpful for relaxation and/or relief of anxiety or panic. Here they are:
Breathe in for 4 seconds,
Hold it in for 4 seconds.
Breathe out for 4 seconds,
Repeat this 4 times.
For more on square breathing or other breathing/relaxation techniques, here are some websites: