Okay, have been giving this more thought:

1) As stated above, have some TV/stim-free time in the main household so he can be out and about with everybody else

2) Also, have a quiet, dark place where he can go so everybody else can have some "normal" time in the rest of the house. This should be a room where he can be relatively closed off. For me, it was my bedroom. We have light-blocking shades, it is fairly soundproof (good earplugs also help), and I knew no one would bother me while I was in there. I got extra pillows as needed so I could sit or lie comfortably for long periods of time and just rest. I stocked up on meditation podcasts, nature sounds (rain falling), and other things that I could do to pass the time without hurting my brain. It was my little recovery cave.

3) You mentioned that you need to be around in case he "needs something." What kinds of things is he needing from you? Are these predictable things? Can you build them into a routine so that he is getting them on a regular basis and then you can have some more freedom through the rest of the day? For me, there was very little I needed "on demand" as long as I had my meds, my recovery supplies, and water, etc. nearby. Of course I needed meals and so forth on a regular basis, but that should be a fairly simple matter to plan.

Hope these ideas help. What other kinds of symptoms or complaints is your husband having?