Bradycardia symptoms?

During a 3 day sleep study in 1995 it was noted that there was an extended period of Bradychardia at 36 bpm. Lately I have 30 bpm over 4 hrs. The regular bpm are in the high 50's. Emergency nurses have recorded 37 bpm. My physician and nurses regularly mention the difficulty in fixing a heart rate. I have had an extensive panel of tests including a 'nuclear injection' stress test followed by a computer aided modelling of the heart.

Lately my frequency of odd conditions has increased.

I realise I am walking exceptionally slowly. I once tried to break out of the slow walk by sprinting but discovered after 2 steps I had not broken free. I checked my footprints in the snow and they did not show any staggering.

Cold conditions. I dress very carefully but a gentle puff of wind on my face gives me a reaction like a punch to the stomach. Simlarly picking up a piece of cold metal I get the kick to the stomach before my fingers register the cold. My physician and Internist say "you don't have a bad heart". My feeling is that I am not pumping sufficient blood. Any similar experiences out there? Meds-Atenolol(bad?), Ramipril,Crestor.