I am 53, have a pacemaker, sarcoidosis in my lungs. over the past few days I have developed an issue that occurs intermittently. I experience fluttering in my chest, my heart rate drops to 40 or just below, I experience pain in my left torso, and lower back on left. After a few minutes it subsides. I went to the emergency room 4 days ago, and they said all looked fine, yet I am still experiencing this problem. I thought it may be from too much caffeine, so I stopped drinking coffee 3 days ago. Any ideas