I am having trouble getting a deep enough breath. My heart beats really hard all the time, especially when doing any exercise. Exercise or activity makes me extremely short of breath to the point where I have a hard time talking to the person I'm with because I'm breathing so hard. A lot of the time, I feel like I just can't breathe deeply enough. I also feel extremely fatigued most of the time. I do not smoke anything, and do not drink more than about once a month. I'm 19 years old, and am currently working at a ranch in CO. We're at about 9200 feet, if the elevation has anything to do with it... but I've had this problem when I was back at home in MN, as well. Any thoughts?