Hey:
Consider yourself lucky.
Your doctor has told you that it's "Early Stages".
That's a good thing. There is much you can do to slow the progress.
If your smoking, quit.
If you're living in the shadow of a steel foundry, move.
If not... Great.
Now sing!
Sing at every opportunity.
You can do that.
By the way, C.O.P.D. stands for Chronic Obstructive Pulmonary Disease which is a collective term for the various progressive respiratory ailments such as Bronchitis, Asthma, Emphysema and so on.
So you are C.O.P.D. but in it's early stages.
Be well.
Jim