I have the same problem here. I am asthmatic as a kid but I never had any serious problems controlling it. I use MDIs regularly and I have attacks occasionally.
But now, I really have trouble with my wheezing and the splitting pressure on my lungs. Even when I'm relaxed, I have difficulty in breathing. The most difficult for me is when I lie down on my back, it seems like I cannot take in enough air to my lungs. When I lie on my side, my breathing returns to normal but I still have the slight wheezing.