Chanice,
Thanks for the post.
Firstly, seeking care from emergency room physicians for a non-emergency is a good way to get poor care. If you are worried in the middle of the night about a new cough, fever, or whatever -- fine, take your father to the ER. But you need to follow-up the next day with his primary doctor. ER physicians are not well-suited, or trained, to take care or more sub-acute problems in someone with your father's extensive history.
If you and your sister are concerned, it is probably with good reason. Seek attention from your father's internist. "Fluid on the lungs" can mean many things: pneumonia, heart failure, pleurisy, etc. An internist can help you sort through this illness.
Good luck.
I guess internist means his own GP or doctor. Sorry the difference in language can be wrongly interpreted. It is my mother who calls out a doctor on call not an ER doctor but obviously you are right not one who is fully aware of my fathers history. Pneumonia is something that has been crossing my mind and pleurisy for my sister. Also the previous heart problems does make me feel there could be something more that is underlying with all of this.
I don't want to be an alarmist but I also want my father treated correctly and I am not convinced this is happening at the moment as his own GP/Doctor is telling him to take heart tablets in the morning and then other doctors are saying it is evening. Who do you believe.