Getting back to the things that your husband enjoyed before his diagnosis will help. That will take some time. Life threw you and your husband a curveball and knocked you both down. Time to get up and start again.
Physical recovery will occur much faster than the mental / emotional recovery. I've been a proponent of including some sort of psychological support during the process between diagnosis and recovery. Even if its just to check in and follow progress.
From experience, it takes time and effort from each of you to discover his / your new normal. The shock wears off over time. (I can assure you that.) I was in my early thirties when I was first diagnosed and it took me almost a full year from surgery until I was back feeling like myself again. Getting back to weight lifting helped me. Being a new parent also helped. The second time through, well......lets just say I'm becoming more comfortable with physical constraints and limited energy......quality of life is there, but I really have to push myself to get through some days. I think the difference between the two separate battles, (besides the obvious - age -), is the level of pain. Hopefully, your husband is pain free or moving in that direction.
Be patient and continue to be supportive of each other. Before you know it, six months / a year will pass and it will be just something you had to deal with as a couple.
Good Luck and maybe think about talking to a professional either one on one or as a couple.