Hard to breathe when being dominated

I find it hard to breathe, as if I'm almost suffocating, when I'm spoken to dominantly. For much of the time, I have to take deep breaths. I am a submissive. Has anyone else experienced this or could explain what it is?
Should I take this to another board?

Welcome to the forum. What is the emotion behind the feeling of suffocation? Is it arousal or panic? Strong feelings can make my heart pound and increase breathing.
There was times when I felt like I was suffocating (not enough air) when actually I was really hyper-ventilating (too much air). My face and extremities went numb and tingled. I thought that I was having a heart attack. They had me breath into a brown paper bag until I came out of it.
Any restriction of breathing can trigger panic episodes for me.