My fiance has PTSD and depressive symptoms, for motivation for him, I find it's good to tell him in advance that he has to get dressed and do >insert thing here< like...the night before, and if he's struggling, offer to help him with it. So if I ask him to cook dinner and he doesn't have the motivation, I ask him to just chop the potatoes and the meat and I'll do the rest.
I've kind of adopted a I will not leave you alone until you do >insert thing here<. It's pushy, and it doesn't always work, but I give him kisses, and poke him and tell him I will not leave him alone until he gets up and has a shower or helps me with the shopping or goes for a skate with me. He usually gets up and does whatever it is within about half an hour and when he's finished, I thank him for it, tell him I love him and he generally feels better about himself for getting up and being active.
We've also recently adopted a time table of housework. He doesn't work, so it's easy for him to just sit on the lounge all day feeling bad about himself. I'm quite busy now and simply can't keep up with all the house stuff AND help look after him AND keep up with study AND have my own down time, etc, etc. I asked him to pick the tasks he prefers, and write in when it would be most convenient for him to do them... since making the time table and with some little pushes from me to stick to it, I now receive text messages saying he's cleaned the kitchen, put the washing away and tidied the house. Then when I get home, I thank him and he has a sense of pride in what he has completed.
I think check points can also help, though, so your husband can SEE what he has achieved.
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