(This is just a helpful insight for me at the moment, and I wanted to post it to share and to keep it for my own reference.) It’s from the Q&A Blog by Michael Brown (http://presenceprocessquestions.blogspot.com/2009/06/is-my-doing-this-procedure-harming.html)
Q: I am trying to breathe through the fear, but I don’t know what to do externally to mitigate this situation.
A: Do not try to ‘breathe through the fear’ – as in ‘trying to use the breathing to make it go away’. Rather be with the fear unconditionally, as it is arising in your experience, whether you are experiencing this fear during your 15 minute breathing sessions or outside of the practice. Whenever this fear arises within your awareness, be with it unconditionally through pure felt-perception. Feel it as it is and allow it to be with you as it is. Do not try to manipulate the experience by attempting to turn the feeling into something else – into what you would rather be feeling.