@labrown Sometimes we or a loved one experience something novel followed by an unwelcome change. It is often likely that the two are related, but they also might just be coincidental. As in, 'happened coincidentally', or 'at the same time'. This is the 'Post hoc' fallacy (an error in logic known as 'post hoc, ergo propter hoc', or in English, 'After this, so because of this.'

Also, it sometimes isn't just one or two things that bring on a mood change, or a cognitive one, but the cumulative effect of all of them.....ganging up on the person and wearing them down.

Time will tell, but if your husband is able to respond well to the physical part of the healing, then daily walks will help a lot for mood. Nothing quite like the Sun in one's eyes to improve mood and sleep. Morning sun is a great aid for that night's sleep.

It is normal for a person to feel anxiety or to feel depressed when his/her life is about to change. Restoring as much normalcy, as much routine, as much security, is important to do as soon as possible, even putting pressure on the person when they don't want to do anything but to stew. Naturally we want to retain the dignity of the person and not add to their stresses and burden, but gentle and frequent encouragement helps. Also, he may need some mood altering medication like Ativan or temporary use of an SSRI. After all, the brain ages, as does our body, and maybe he needs to be evaluated and get a hopefully temporary prescription to help drag him out of the shadows.