If you can manage it try to get a few minutes fresh air every day. A 10 minute walk at lunchtime, for example.
Have a simple meal plan and stick to it. Think few ingredients and few items to wash up. And make sure you have a take away or a meal out once or twice a week.
IME, making dinner, eating it, making a packed lunch if you need to (maybe buy lunch a couple of times a week), washing up and emptying the rubbish are best done before you sit down. If I rested first, I often wouldn't do all the things I needed and even if I did, I tended to do them slower as I was more tired.
In general, don't make any social plans during the week. You might need to limit phone calls or messaging people too, as all of this saps energy.
It is very important to feel like you have an evening of a couple of hours to do just what you like before bed, but think about limiting phone, tablet and or laptop use. I find it much more relaxing when I read a book or watch tv. Otherwise it will feel like work and sleep only.
Order an online food shop to be delivered on Saturday or Sunday morning. That way if there's something essential missing that you definitely need, either you or your DS can quickly nip to the shops on Sunday instead of having to go after work.
Try to keep laundry and basic housework (eg vacuum downstairs and clean the bathroom) to weekends. If I were you, I'd start delegating some or all of these tasks to your DS ASAP though.