The last four nights in a row, i have had shortness of breath and a hard heartbeat that is more elevated than the daytime or what is normal for me. No medications or anxiety, no change in diet. My resting heart rate is usually about 65 bpm, but at night it hits about 75-80 and it beats hard, i can feel it sitting still without checking my pulse. I can go to the doctor but I am concerned enough that I may need to go to the ER where I know they can do an EKG or other tests now instead of waiting to see a cardiologist. Any advice?