I am exactly the same. I too have asthma & finding it so difficult to breathe. Especially when bending to pick up something or put on footwear.
I Get Like That Sometimes.. I Think It's Cause The Baby's Positioned So High Up, At Least That's What It Feels Like For Me..
I Usually Try To Sit Down Or Lay Down And Take Deep Breaths.. Sometimes I'll Even Play With My Belly To Try To Get Her To Change Posititons So It Can Help