Miller,
This is standard operating behavior for those who have yet to be hit by a "bolt from the blue" and compromised to one degree or another. It's like, "Forgive them father for they know not what they do" (that is, until something happens to them).
People have gone as far as belittling and even laughing at me for alluding to what I went through; though, while it could have been much worse, was traumatic nonetheless. Respect for my fellow man has measurably decreased since my ordeal over six years ago, not because I'm embittered over what happened to me but how I've been treated by my peers. Life is a Social Darwinist, competitive struggle and it's easy to roll with the punches when you're on the young side and in good health.
I never knew fatigue like I did before and for many months after my surgeries. I passed out behind the wheel for the first time in my life and came to in the opposite lane of a major road, broadsiding a snowbank. I had no control over it. Luckily, no one was coming the other way. Before my surgery I was so tired I was literally crawling around the house. After my surgeries I would fall asleep constantly, taking naps throughout the day.
I could tell you some stories regarding the nastiness I've gone through with people but this not the place for it.
The good news is that the fatigue eventually fades as time goes on. It's important to stay as active as you can to keep limber, stabilize equilibrium and get good oxygen.