Some tips for managing fatigue-
Don't do anything standing up that you could do sitting down. Don't do anything sitting up that you can do lying down. (Midwife told me this after having my first baby but it also applies here).
Always take something with you when you leave a room. Eg dirty clothes to go in the basket, cups for the dishwasher etc.
Spread your tasks through the day. So if I planned to have a shower, take the bins out, play a board game with the kids, make packed lunches, prepare a meal and do a load of washing I would di ibe task, rest, another rask, rest etc
Alternate brain jobs with body jobs. So make a phone call, rest, wipe the kitchen, rest.
These depend on you being at home and not working or looking after small children and those scenarios make managing fatigue really really hard.