The comments here from vegan and fredd are shocking. 
So it came on when op was pg? so? Dh developed diabetes, at the birth of ds1. How inconsiderate. Why couldn't he have waited?
Are you for real?
No, not this week please. let the disease/disability start at a more convenient time? 
A bit of sympathy and empathy might not go a miss. Or else why don't you just LTB and let him cope on his own with his 'supposed' pain?
Look at ways his pain can be managed, get some more specialised advice, look at your strengths and his. he could do the finances and admin bits, whilst sat at home, if that eases things for you. Sitting at work is a lot easier than looking after two young ones!!
Or is the above advice pointless? You sound resentful and that you don't really believe he's in that much pain. If you really feel that way, about HIM, a real lack of respect, if we are being honest, then isn't your marriage over already?
I have a health condition since birth. Not awful, but has its affects. Dh has several conditions, from later life. If I found out he felt the way about me that you feel about your dh, it would crush me inside.