i have stage 3 COPD and use 02 for exertion and sleep. I am now having problems with chest pains. I have history of high blood pressure & cholesterol and take medication. I am scheduled for echocardiogram & nuclear stress test. Seems like I am more short breath and wonder if it has to do with my heart or COPD progressing? Big family history of heart problems so always a concern. Curious if anyone else has heart issues, would like hear from you.