Hi Doc, May concern towards my health are having Shortness of Breathing(SOB), got nervous or feel dizzy sometimes or let may say my heart beat runs so fast everytime I laugh too much, just like my heart is sqeezing..When I was in high school I was exempted during our P.E. because many times I m collapsed at school. During that time I was taking a medicine as what the doctor s advice then if I should not becareful I might have hole in my heart. What I am afraid of is that last June I feel exhausted & hard to breath for an hour.Please can you help me Doc with regards to this concern?Thanks,Virginia T. Niez, 35yrs. old