When it first began I would think, "I can't breathe," but DH is a firefighter/emt and when he would check he'd say "you are getting air in."
I have since learned that this is the hug. I feel like I can't breathe because it feels so tight around my chest.
However, as we have seen with others, don't assume it is the hug. Check with your doc to make sure there is not something serious going on.
HOpe this

feels better :0