Hi Mr. Sri,
Welcome to HCM.
Pigmentation of lips can occur in chronic smokers. It can also occur due to vitamin B deficiency
. You have to suspect heart disease
if you have breathing problems, feel like fresh air suddenly, have chest pain
which spreads to left arm and shoulder, can hear your own heartbeats etc. Slurred speech as much does not seem to have a corelation with heart disease but could be due to weakness of facial muscles
. I suggest you get in touch with your family physician and get a complete lab workup done to rule out causes of your sudden tiredness
. As you are 40 years old now, regular health check ups is recommended. Thanks.