Shortness of breath dizzy pain in sternum irregular heart beat. january of 08 i had bloodclots in both my lungs, from there i have shortness of breath pain in sternum in my chest it would come and go get less and less till about month ago i started getting dizzy and short of breath, pain comes and goes but the shortness of breath has stuck with my dizzyness comes and goes, and lately just the last week anytime during sexual intercourse or masterbation my heart races and has a irregular heart beat along with shortness of breath.. and has started to do so without sex, i have been to the er doctors ekgs cat scans xrays numerous blood work they cant find nothing. can any1 help i see that many people have the same problem, i dont like going to sleep not knowing if i shall wake up the next day... :-( :-( :-(