I experience shortness of breath going up stairs and even walking across a parking lot. I am currently on 2 meds for fluid retention/high blood pressure, which controls swelling primarily in my left ankle and leg. I have had breathing tests and heart echo and all check out. I am overweight - could my weight, specifically, in stomach area, be putting pressure on my diaphragm, restricting my breathing? I regain normal breathing within 30 seconds after activity ends. Any other ideas?