Thats awesome they found it with your heart monitor.
Back in 2020 i went for my daily 3-5 mile walk i was really struggking just walking i could catch my breath it was the craziest thing legs tight chest tight it had never happened on a walk just when running and biking. I went to the emergency room and they admitted me and found nothing. They ran a ECG,EKG and did a Angiogram and did not do a stress. My resting was 22mmHG they sent me home after three days said i had mild cardiovascular disease, said my veins leaving my heart needed to dilate so they put me on carvedelol. Made me wear a heart monitor for 2 weeks
And found nothing.
When i saw the mayo doctor in dec he said i had heart failure at that time.
In fact he said everytime i got those feelings while exercising i was in heart failure!