I have always been athletic.now, i can't throw frisbee w/out stomach tightening causing breathing dysfunction. can't get a breath in. even if it's light curls, stomach fullness. lbbb not it. advice?

Exertional Chest pai: These are somewhat concerning. I would definitely get a stress test and an echocardiogram. I am not sure what do you mean by lbbb. If you have lbbb, that usually means heart disease and more extensive testing might be warranted. I would see a cardiologist.

NO: Especially with normal ef it should not be the case. But something else might be causing your shortness of breath.