New and a Question

I just signed up with this site and am very glad for the new support system. My name is Jennifer and I am 27. My father (51) went through a series of mild heart attacks last Ocotober. Had an angioplasty done due to a %90 blockage of one of the arteries. That failed but didn't know it until 3 weeks ago. He had a double bypass 2 weeks ago and had not been feeling good at all. We knew that was to be expected but he had to go to ER yesterday. He coughed and tore open his wound (it was only the surface) but lost enough blood to have to have some given to him. God works in mysterious ways though. He has only been breathing off of one lung because the other one was filled with fluid...no wander he was having a hard time with his chest. I have been doing a lot of research about recovery and knew something wasn't right. My question is: Is this normal for a lung to fill up with fluid and do you know if there is a chance it can happen again? I love my Dad and can't imagine my life with out him. I have been trying to find all of the info I can to educate myself but have been unsuccesful finding anything about fluid build-up in the lungs. My mom has enough on her plate right now so I hate to bother her. Thanks in advance for any advice, help or anything else you can share with me. Jennifer P.S. My dad smoked 2 packs a day for almost 30 years and quit last October after his heart attacks! I got my cholestrol checked yesterday and am the way to a healthier lifestyle. :)