I passed out one more time in the afternoon frightening the nurses before receiving a pacemaker that evening. During the operation the surgeon who was a keen jogger was chatting with me about the high correlation between endurance exercise and heart rhythm problems.
Things are back to normal now, although my blood presure is on the low side and I can get very light headed when I stand up. I can also get a bit breathless if I'm sedentary for a while and then I stand up and start walking and talking at the same time. The most disconcerting thing though is when I suddenly feel quite anxious as though I might pass out. Of course I never do pass out, because the pacemaker is there to fill in the pauses. For me, keeping active is the thing that makes me feel good and keeps the anxiety in check.
The pacemaker is configured to keep my heart from dropping below 60bps and on average it's pacing about 70% of the time. There is no rate response configured so the pacemaker doesn't need to speed up when it detects movement and I also don't need to take any medication.
There are quite a few reports into cyclists getting arrythmias and I went into Ventricular Tachycardia whilst on an exercise bike. I didn't pass out but I was only taking it steady so was surprised my Afib turned into VT. Anyway they cardioverted me out of VT and stuck an ICD in me. They cardioverted my Afib and, fingers crossed, I am still in sinus rhythm.
I still do get light headed if I have been sitting down and relaxing but I think that's due to another condition, heart failure, which is a failure in the muscle wall.
I agree with your comment about remaining active. I'm off for a few days cycling in germany tomorrow - in the north where its flat - and I hope to be able to tell the cardiologist all about it at my appointment in a couple of weeks time. I always take things very steady and monitor my heart rate when cycling. It's a balancing act between doing some beneficial exercise which does, as you say, make you mentally better, and making sure that the condition doesn't catch you out. I would go nuts at the prospect of sitting in a chair watching TV for the rest of my life. There's never owt good on :-)