Hi, Kelly. Welcome to the forum.
I'm sorry you have to deal with this but frankly, AN post-operative fatigue and listlessness is not uncommon. Some AN patients go through it quickly and some take longer. I was quite fatigued and listless for about 3 days post-op. By two weeks, I was driving again. However, I was even more impatient than usual for quite some time after my surgery (about six months) to the point where my very supportive wife of 37 years asked the doctor (privately) if the surgery could alter my personality. He said it was possible. Not due to the actual tumor removal but due to the shock to my psyche from the reality of having this major medical crisis (I had hardly ever been ill up until then) and the fact that my formally excellent hearing was now compromised and wasn't going to improve as well as my forced realization that I was mortal and physically vulnerable, something I only thought of in the abstract, up until my AN diagnosis.
As prior posters have advised, give your man time to heal and adjust. Help him, but don't be over-solicitous, as my wife was, which made me feel like an invalid. Men don't like feeling physically vulnerable and/or an object of pity. After major surgery and heart complications, your husband probably feels like he's been diminished in some respects. Encourage him to get out and move around and, in time, to do the things he used to do. Ask him for help if you need it, even if it's only to reach something you can't. He needs to feel useful again, not like a sickly burden you have to take care of. I know. I felt that way for awhile and I highly resented it. No one's fault...certainly not my loving wife's doing, but I needed to feel competent and effective and until I did, I was crabby and detached. Your husband may be experiencing the same feelings, so give him time and don't 'smother' him. Let him be the man he is, not a frail 'patient' who needs constant supervision. I trust he'll be fine in due time.
Jim