Hello beddygood , greetings from healthcaremagic.com
I have gone through your case scenario and i believe it is very unlikely that your bradycardia has any active relation with your inflamed lymph
nodes. Also inflammed lymph nodes are most commonly secondary to infective pathology and most of the times it get resolved when the infection is controlled , so if you don't experience the abdominal pain
on a regular basis like you had earlier have felt, you need not worry . Regarding your bradycardia you have not mentioned the rate they have found for you. Normally heart rate
less than 60 beats per minutes is known as sinus bradycardia
, sometimes general population do have sinus bradycardia in the range of 50 to 59 beats per minutes and do not suffer from any obvious disease , which might be the case for you . Some athletes do they have sinus bradycardia but their myocardial reserve is high or in other words their heart needs to work less to pump blood than a normal individual. I do believe it is always better to get evaluated by a cardiologist and if necessary get a echocardiogram
done for your heart to rule out structural abnormality if any. Hope i have been able to clear your doubts. Take care.