I have MS, so I am tired CONSTANTLY! Here my way of doing things: start really small. Whatever You're expecting to be able to do, cut that expectation in half. A pull up? Nonsense. I get them 25lb weights and do what I can. Cooking? You mean making the whitest tacos possible with whatever's in the fridge. The trick is that when you start small and easy, the next step is just as easy as the first when you started. I worked myself up to 25lb weights, and I'll work myself up to 30. I know how make the tastiest, whitest tacos you will ever eat.

The second trick is to get excited. You're not able to do anything you don't want to do. Some people, especially those with ADHD, struggle with delayed gratification of course. If you have that problem I suggest just constantly keeping track of what you're doing so you can look back at your progress to get that gratification. I track lifts with hevy, I track weight with withings, hell I'll take a picture of a room before I clean it. I don't know if it works with everybody but it works for me.