Regarding low heart rate(cardiac Bracardia)however you spell it?

I have not been an athlete for many years now and I exersice when I feel like it, hardly much. My dad has a pace maker, my granddad and uncle died of a blood clot to thier hearts, my 6 year old son has a heart murmer and gets chest pains sometimes. I have had 2 holter moniters, and the cardioloist dianosed me with Braycardia. It misses several beats in a row then beats again sometimes very faintly. The first holer about 1 month ago showed my paulse at about 3am to be 39 beats per minute, and the last one 41 beats per minute. My heart rate just then was 6 beats per minute for 10 seconds. I have gotten very lightheaded with it, and seeing stars, and I have had chest pain with it. The hospital said they would not give me any medication when I was brought in by amblance becasue they said ot could give me a stroke, or a heart attack. Where they right?I have an ultrasound to my heart on the 21st of this month, as they got me in very quickly, and I will see a cardiolisist in a public