I was recently diagnosed with a severe case of heart failure. I was an unlikely candidate.
I have never smoked, I'm not overweight, my cholesterol levels are good, I don't have high blood pressure, and there's no heart disease in my immediate family.
Now when I read the major symptoms, it seems it would have been obvious. But I was an unlikely candidate, and there were other things that were reasonable to blame my symptoms on.
If you have any symptoms, even if it seems unlikely, get tested. The easiest test is for BNP, a protein in the bloodstream of people with heart failure. An echocardiogram is the definitive test to confirm the condition.