When my BP was getting out of whack early last year my pulse was jumping way up and I would shiver uncontrollably. That's when I had the monitor on for a month. Only caught one brief episode of afib that I know. That's when I was in a junkyard getting Neon parts and my pulse hit 180. As scary as those shivering episodes can be I think the longest might have been a half hour. Has happened several times, but nothing more than a few minutes for several months now. So, yeh I guess knowing your actually in afib for that long would be quite concerning to say the least.