Shortness of breath/lightheadedness when reading aloud

[assured]

I homeschool my children and have started a program which requires more reading aloud.  I noticed that I feel a bit lightheaded/short of breath when I read aloud.  It also makes me feel sleepy and yawn.  I am concerned that this indicates an undiagnosed heart/lung disease.  I did have a pretty extensive heart workup 18 months ago.  EKGs, blood work, chest x-ray, echo, thallium stress test, 72 hour monitor, and a cath.  I know that reading aloud made me feel tired even back then.  If it was a lung problem would the cardiologist have picked up on something being wrong (I was in the hospital for 3 days and nights)?

Worried.

[deedle1976]

Perhaps you are hyperventilating when you are reading aloud and taking quick shallow breaths instead of deep ones. That can make you dizzy.

[thethinker]

start by walking or riding a stationary bike.  Then you can build up from there.

[assured]

Hey, don't get so personal :).  Really out of shape because I'm afraid I'll drop dead if I try to exercise.  I know, not a very intelligent way to think, but there it is.  

Thanks for your response...I'm sure you're right.

Assured

[Itschuck2c]

How much exercise do you get..just plain out of shape.....