My young son has VSD which is a heart defect. Some tell me that he should be fine but in the last several years he has had a lot of problems with wheezing along with some other things and I do not know if I should be concerned or not? He was recently diagnosed with asthma but I am not sure that that is the problem either. He has a bad cough that is only at night and when it is hot out his face becomes red and he becomes very lehtargic. Please any information would help along with any opinions too. Sould I be worried ?