Hard to breathe - possibility of lungs filling with fluid, as his heart function is so low, he is not exchanging oxygen across his lungs correctly.
Listen to his lungs does he sound wet. if so he needs to back at the hospital to control the fluid build up, I'm sure you probably already have the tablets amoung your collection of drugs, but best not to treat yourself.
Frusemide is one of the drugs to clear fluid, makes you pee like crazy, but could be a problem if he has kidney issues.
Frusemide gave my Mum drug induced dementia, horrible, she didn't know when or where she was, until I begged them to stop giving it to her, but for husband saved his life, so crazy that it works so well for one and not for the other.
Do you have a heart specialist hospital within driving distance, and does it have a emergency dept.
Again local hospital nearly did for husband, but heart hospital totally different story, they admitted him and kept him for 8 days nand stablised him.
We have since been in the care of the heart hospital ever since, and even the junior staff their have made mistakes.
I educated myself about heart failure, bundle blockages (electrical activity of the heart) dialated cardiomyopathy, which is what my husband has, at first got on the interenet, and read dr to dr papers, university papers, and even borrowed books from the library until I understood what I was dealing with.
My knowledge and lack of medical training has been questioned by junior staff much to the senior professors/consultant disgust, he told them off in front of us, and demanded they meet him in his office with husbands file, would have loved to have been a fly on that wall.
Nurses amazed, she said nobody talks to the consultant like that.
I Do when it comes to my husbands life, he seemed to be very freindly and nice to us, but I wasn't asking silly uneducated questions either, and i refuse to be frightened by him as are the staff in the hospital, they are terrified of the man.