Sway..just had to add my own 2cents here too. I struggle with how much does my husband understand as well. He reads articles, he asks questions about my meds and symptoms, but he never really understands. We had a good talk one day about how we both have to accept that he will never really understand or empathize, he can sympathize though. I really think it is necessary to come to that acceptance between both of you.
I also have found out that talking is the best thing. Like others said, I try not to make my whole life about CD. Sorry, but men are like puppies...you have to rub their nose in it when it is happening because they won't remember in a discussion later. No sexism intended, I just think it is the way men are programmed (they are instant and visual it seems). If I am feeling lousy, I tell my husband right out what the problem is (I am exhausted, I have bad D, I am scared about the future, I can't eat) then I explain the consequences for right now because of the problem (I can't get off the couch, I can't leave our house/bathroom, I can't think about serious things today, I don't want to decide on dinner). Cause and effect in 1-3 sentences.
It seems to help when I make it cut and dried for him. He'll ask another time if he wants to know details. keep talking...it sounds like you have a good guy there!