What Causes Shortness Of Breath And Fatigue?

Hello, for the last several months my father has been retaining fluid in his ankles, legs, arms, and hands (extreme swelling/edema). It started in his ankles and has moved to his upper extremities. He is experiencing slurred speech, absentmindedness, shortness of breath, fatigue, and trouble walking due to his shortness of breath. I recently noticed his face (and scalp) is turning pale with a yellowish hue. When he takes breathes he has to take a double breath, especially while sleeping. He has gained weight and his belly is distended, which I believe could be a liver issue. He craves sweets quite often such as doughnuts and cakes. My grandmother (his Mother) passed away approximately 2 years ago of congestive heart failure and she may have had diabetes as her mother passed away from it. As a result of my research, I believe my father may be suffering from a liver/kidney disorder, diabetes, or congestive heart failure caused by the former. Could this be the case? I appreciate any advice you may offer. Thank you, Mya