I Have Increased Shortness Of Breath, Getting Worse Over The

I have increased shortness of breath, getting worse over the last 4 weeks. I just tried to walk around the middle school baseball diamond and had to stop twice. I'm 71, have had a mitral value repair 9 years ago. I've never smoked though both parents were two pack a day Camel (unfiltered). In the passed two weeks I've had trouble walking a short city block without stopping to catch my breath. And, I've been coughing up a lot of mucus (mostly clear but sometimes with rust color, I'm guessing dried booth). Any thoughts?