My experience with breath and mind: I have panic attacks and I perceive that when I have panic attacks the breath is erratic and is slower unless my panic spikes and then the breathing becomes faster until full blown panic ensues. Not a fun place to be, let me tell you! When angry, I notice the breath becoming more "deliberate" in the in and out breath. To me, "watching the breath" is not Anapanasati, it is "watching the breath." To me, REAL Anapanasati is awareness of breath, body, etc. I really do not appreciate concentration being taught as meditation, i.e. in many modern "meditation" groups. It simply and truly is not. The Sutta is deep. "Watching the breath" is not. Thank you, Stefos