I'm experiencing periodic heart palpitations and mild shortness of breath when going up a couple flights of stairs, or walking briskly up a moderate grade. I've noticed this in the last 4-5 months. It is slowing me down when running to catch a bus, and impairs my ability to hike with friends. Since Dec I have had the flu and a cold almost continuous (constantly being reinfected by grandchildren). Would there be a connection? I'm reasonably fit, no conditions of note, and my doc says I have low LDL and high HDL. No drugs except for finasteride. I'm 70, 185 lbs, 6'2". Should I see a doctor about this?