Im 20 years old, height is 174cm and I weigh 56kg. I have shortness of breath and fast heartbeat after walking up stairs (from first floor to second) or after other simple activities like getting out of bed and getting dressed. My normal heart rate is 70bpm, after I walked up the stairs it was 130bpm (I wasnt even running). Also I started exercising a couple months ago and the elliptical doesnt let me go fast because my heart rate goes up more than 140bpm. Do I have a heart problem? Oh, and sometimes when I wake up and get out of bed right away, I feel a bit dizzy and I often feel lazy during the day even though Ive slept more than 8h. P.S. Im a smoker, but trying to quit. I smoke 1-3 cigarettes a day.