Hello, I'm a 32 years-old man who's in general good health. I had my annual physical last month and everything seems to be fine, other than a minor heart murmur in the mitral valve that I've had for 15 years. Yet, I keep having this spells when I seem to loose all my strength and feel I'm going to pass out or die. They last about 5 to 10 seconds. Then I'm fine. Could it be heart related? Thanks.