I went to my doctor 5 years ago because I was feeling tired and lethargic. He did some blood tests and they came back fine so he put me on a 24 hour holter monitor. The monitor showed that at 5.30am my heart rate while asleep was 33bpm, the rest of the time while resting it was in the 40-50 and while awake in the 60's. He referred me to a cardioligist, he did all the heart tests including another 24 hour monitor this time while asleep my heart rate was 46 bpm at one stage the rest of the time the same as before. After all the tests - stress test, ecg, ekg, bloods, ultra sound on my heart, lung test etc he told me that I suffer from anxiety but my heart if fine. I got pregnant had my daughter and then decided I wanted to double check this so I went to another cardioligist all the same tests - the holter monitor showed a reading of 48 while sleeping. And he told me the same I am health and there if anything is stress in my life that causes anxiety. Some times I feel tired and faint but the doctor tells me this is my anxiety and when I take my pulse when I feel like this it is 60-65ish.

My questions is why would my heart rate have dropped to 33bpm, is this dangerous and should I have regular check or see someone else? During the day my heart rate is around 60 - 70 when I check it (and the monitors all show this),so why is it dropping at night. Please answer - not sure why I am stressing about it now it has just come back and hit my like a tonne of brick that I never got an answer.