My heart rate is all over the place. From 65 to 90 to 75 in a couple of minutes without moving a muscle. It seems faster and more irregular when I am resting. I am waiting for the 24 ECG. I can walk up hills, no problem then I sit down and it's everywhere. Also have bad reflux at momen. Just had half 12.5mg Atenolol and this drops my hr and BP low. Chest pain at moment as well. Wish I new what was going on. Never goes really high, like over 100. Anyone else hot same probs. Drs don't know but last year cardio perfusion stress test was normal.