Low heart rate at rest of around 50 bpm is by no means life threatening and should not cause any problems (according to at least 2 cardiologists). Only if it's accompanied with loss of consciousness or serious loss of breath. If and echo and holter are showing no issues, then there should not be anything to worry about. That's what I have been told and that's how it seems to be. At least I feel rather confident with this outcome. Annoying it may be, but maybe the best cure is not to follow it up constantly. Easier said than done... I have a lot of experience.
My resting heart rate seems to follow a daily pattern. In the mornings it's rather normal. Usually around 70 bpm. Usually at the office during afternoons it slows down. Possibly to around 50 bpm. I have related this happening alongside with worsening of the other symptoms such as feeling lightheaded and dizzy. When this slowing down was at it's most prominent stage two years ago, I think it was controlling all of my thinking. I kept on measuring it and getting more worried about it. I have had echo and 2 x 24h holtering done, so there should not be anything wrong with my heart itself.
Currently I am struggling with elevated heart rate as well. If I am laying in my bed in the morning, heart rate around 70bpm, as soon as I get up, it jumps to above 100 bpm and I get woozy in my head. Also, when I try to settle down for sleep in the evenings it can hurtle around 90 bpm when laying down and pounding like there's no tomorrow.
The catch is that I still don't know what to think about this...
1. Have I always had slow heart rate in the afternoons and my symptoms are completely unrelated, but I have just made connection because I have become aware of my heart rate behaviour?
2. Is it because I really have a thyroid issue, because the rate has not dropped so slow after I have been on medication?
3. Can anxiety cause slow heart rate?
4. Is the elevated heart rate due to anxiety or am I making it worse by taking thyroid medication?
Anyhow, it seems clear now that my symptoms are not caused by the heart rate, because I can feel the same things even my heart rate is within 'normal' range. So I am thinking the heart rate issues as a symptom- not a cause. But still, symptom of what? I am not so much scared about having any life threatening heart issues because of the complete heart work-up I have went through. So I just try to bear along. I would promote this thinking to others as well.