Jen, It is totally understandable that your desire has disappeared--life has a sucky way of doing that.
Something that might help is to really get in touch with what turns you on. Reconnect with your own body and remember what it is you like about sex. What about doing things like sending H a nice email? "Sexy" might be a little over the top at this point, but you could write about how handsome you think he is. Just any old ego boosting stuff. Or write a note. Or a quick phone call to say "I miss you and I'm thinking about you".
Anything like that to stroke him a little bit, and then concentrate the rest on you. Would things like some sexy new panties help put you in the right frame of mind? What about ditching all the ratty nightgowns (come on, all of us mothers have 'em, lol) and only wearing pretty things to bed from now on, or even nothing! Or getting a book of erotica and reading a little now and then..
I know these suggestions might not appeal to you, but I think it is essential that you get in touch with what turns you on so that this doesn't become a project about your H, but rather a project about YOU.