Don't think those stress tests reveal much; are you also going to get a heart calcium scoring scan
? According to this doc, more than 20% of the patients who pass a stress test are revealed to have heart problems by the scan.
My doc recommended Eliquis for my Afib; what are you taking? Is a change of meds being considered? I've never taken the recommended Eliquis, despite my irregular heart beat which was also diagnosed as 'Afib.' Don't want the side effects and lowered blood pressure. I think my heart is strong...but 'syncopated;' it moves to a different beat. You may wish to review your meds, and start questioning your doctor more closely. With all the exercise you get, you're far different than any of his other patients. And probably don't need the same treatment they do.
For instance, your blackout could have resulted simply from low blood sugar and walking into an overheated restaurant. I know I'm wary of fainting suddenly in such conditions. Good luck.