Bradycardia?

Hi, I have just come out of hospital and I'm still scratching my head wondering what happened. I have been feeling unwell for the last 6 months with dizziness and brain fog and I have actually collapsed with this . A few days ago I came home from work felling very unwell. When home I deterioted further. I had pains in my left arm, tightness of my chest, fuzzy head, confusion and shortness of breath. I feared I was having an heart attack so I phoned 111. I was quickly sent to A&E. They gave me an ECG and blood tests which ruled out an heart attack. They then tested for a blood clot which again was negative. I was observed on a monitor for 2 days and this showed I have a low heart rate which was dipping below 40 at rest. I was then sent home with no diagnosis and being told I would be referred to outpatients for further tests. I am now home recovering but I am still having chest pains albeit no near as bad as the other day. I have researched Bradycardia and it seems this could be what I have. Has anyone else experienced these symptoms and do you feel this could be my issue. Thanks for reading