these are worrisome symptoms: shortness of breath and passing out. after a bypass operation these symptoms could reflect some damage to the heart leading to heart failure symptoms (the shortness of breath) continued abnormal blood flow to critical areas of the heart (also the shortness of breath) and/or a heart rhythm problem that led to the syncope (passing out). these symptoms warrant a very careful evaluation by your dad's doctor and an explanation. this sounds like more than the "normal" healing process. i suggest that you (or another family member) accompany your dad to his doctor's appointment and make sure that the doctor fully hears the story. this really needs follow-up.
is it normal for my dad who had a triple bypass three months ago to be constantly short of breath and blacking out?