Holter reports average heartrate 60, total beats 84354

Hello, sorry this is a long ramble.  I went to the doctor because of low body temperature which is always around 35.4 in the mornings and 36.0 in the late afternoons, and slow resting heartrate, which is 44 to 55.  I figured all this was due to my Hashimotos hypothyroidism.   I have had occasional events of near-fainting sensation (always while sitting still and relaxed).  This has been when my resting HR has been in the 40s. My blood pressure is in the low range of normal, except when I get really stressed, then it shoots up. I have had this problem for a few years now, along with fatigue and fibromyalgia. I am otherwise healthy, take no meds except thyroxine and paracetamol, not overweight, no alcohol and eat well.

Because my thyroid function tests are all normal, doc said it isnt my thyroid, and dismissed my report of low body temp completely.  But he referred me for a 24hr holter monitor.  I seem to have a default setting of 60 bpm for normal activity, ie walking around, pottering about the house etc.  The Holter result  says  that my average HR over 24hrs was 60, max 109 (during very strenuous exercise) and low of 40 (while asleep). Standing alone, all those numbers look fairly normal, from what I can find out on the net.  But would the monitor show how often my HR is well below 60, as I know it often is, but I don't think the doctors believe me!  In the doctors rooms if they take my pulse, it is always around 70, as I am so wound up and stressed.  I am not an athlete, I am 63yrs old and not fit but  I take a moderately paced walk every day, 20 to 30 minutes and try to be as active as I can generally.  For the benefit of the monitor, on that day I took a very fast 20 minute walk (just short of a jog!), which is when the 109 bpm was recorded.  Normally I would not ever have a HR of 109. 

It's all a bit weird, because before this slow stuff all started, about 5 years ago, I used to have a fast/normal HR, and as I have generalised anxiety disorder, I am used to worrying about a fast HR, not a slow one!  About 10 years ago I used to get supraventricular tachycardia sometimes. It went away and never came back. I now get occasional palps, that come in bouts. The holter identified them as PACs including some couplets.  The day of the recording I only had a couple, but some days I have dozens.  I put them down to anxiety, and I try not to eat or do anything that sets them off, as they scare me, even though I know they are (apparantly) OK.

So I guess my question is, is 84354 beats in 24hrs a bit 'slow' or 'normal'?  Is bradycardia when you have under 60 bpm all the time or just some of the time? Do they diagnose brady on the calculated average HR over 24hrs, or on noted HRs under 60bmp ?   I have not had a followup with the hospital doctor yet and have not seen the final report, just what the technician told me when she took the monitor off and checked it.  She said there was a lot of artifact on the recording but I have not been asked to repeat the test.

Thanks for reading

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