Just to give you a different picture, my husband has a serious heart failure or dialated cardiomyopathy, with orginally a left branch bundle blockage, that showed on his ECG, and we were told not to worry about the LBBB, it isn't a problem.
A few days later he collapsed at home, couldn't seem to stay awake, he kept drifting off sitting in his easy chair, and I noticed he was sweating alot,and panting for breath, eventually called ambulance service, they took him to local hospital, he was in congestive heart failure, during all of this he had NO PAIN.
Discharged following day from the hospital, no medication, no indication he had even been sick, just told by so called cardiologist that he was fine, he collapsed again at home 12 hours later.
I drove him across the city to the heart hospital where they kept him for 8 days, stablised him, found out what was wrong, see above, and treated his condition with drugs.
Five years on he is doing well, watching what he eats, walks 3 - 4 kilometeres a day, yes he still has heart failure, and the LBBB has progressed to RBBB as well, pacemaker installed to support his heart 6 weeks ago, that has improved him out of site, no more breathlessness, and energy levels back to where they were before the heart failure even occured.
Echocardiograms every six months to watch what his heart is doing, from what I can see as a normal non-trained medical person, that seems to be the only way they can really diagnose whats going on, of course his echo's are done in the same specialist heart hospital where they treated him correctly in the first place.
I have alot of confidence in our senior cardiologist, but getting to see him can be interesting to say the least, he kicked butts even the last time my husband was in as his symtoms do not match the text book, and junior staff assumed he was better than he was in reality, and even in the heart hospital they delayed his treatment, pacemaker, and gave his pacemaker to someone else who was sicker, that was until the consultant specialist saw him and started raising cain, some very long faces from junior staff members when he started dressing them down in our hearing.