“What breathing method is the most effective in coping with anxiety?”

I like "The Relaxation Response" as explicated in Dr.Herbert Benson's book by that title. It's easy and quick.

There are all kinds of breathing techniques designed to promote relaxation, one of the behavioral techniques to help cope with anxiety. The one best for another might not be best for you. Search a number of relaxation techniques, see what appeals to you, choose two or three and discover what seems best for you by way of practice and trying them out.

Hello - there are many breathing methods that are successful in Interrupting panic! There are entire books dealing with these methods; one I recall is by James Nestor. There is also a nice biofeedback device called a Stress Eraser that trains you in the breathing rhythm that works best for you. It is a small, handheld thing, about the size of a cellphone - but not the cost, fortunately. If none of these does it for you, i suggest you find a practitioner of clinical hypnosis on the website of ASCH who can teach you a simple method of relaxing when feeling panicked. Good luck - you share this problem with uncountable numbers of others. Peace, (Dr) Marian Shapiro Licensed Psychologist