Shamus, I was in similar situation. Low heart rate a-fib, tachycardia, and every other arrhythmia. Have had 4 ablations since 2015, cardioverted 17 times, developed complete heart block with rate of 25 and heart stopping up to 14 seconds at a time. Got a call after Holter monitor reading at 6 am to come in for an urgent pacemaker insertion. Got to EP lab at 130pm and was on the table at 2pm. Saved my life. There were issues with programming several times. Heart rate would jump to 140 with several E-room visits and finally corrected pacemaker programming issues. Still have arrhythmia issues and on my second 4 wire pacemaker. Without out it I would not be here. Cardiologist tried to correct it pharmacology with a myriad of drugs from Tykosyn to isobromide, metoprol the works. Was feeling better then had hip replacement that got infected stem. 3 yrs and 6 surgeries later I'm still in pain and heart issues returned. I'm 74 and my quality of life kind of stinks but I muddle through it and do what I can. Was a professional athlete and its taking quite an adjustment but its better than the alternative. I walk several miles a day taking rests when needed and enjoy sunrises daily. Do what's needed to survive, try different Drs, and contribute to your surroundings! Remember your better off than most and worse than some! "Always look on the bright side of Life". Monty Python!