Hi Lislou. Well done to your dh for the weight he's lost, and well done to you for helping him to do it!
The first thing I'd say is not to let him know that his weight is a turn-off to you. I'm not much smaller than your dh, and if my dh were to tell me that my weight turned him off I'd be straight in the biscuit tin. Concentrate more on the fact that he is taking steps to change his weight - he is at least aware that he needs to lose weight and is doing something about it. Give him lots of credit for that, and let him know that you're proud of him for doing so well. 11lb in a month is brilliant, he must be pleased and it would be nice if you could show him that you were pleased too.
With regard to boosting his confidence, think about other things about him apart from his weight. I presume you still love him even if you don't fancy him much at the moment? Make sure you tell him. Find some positive things about him and the way he is that you can use to massage his ego a bit - tell him he's a great dad, brilliant around the house, anything just to boost his confidence levels a bit. We all like to feel loved and appreciated, and men are just the same.
In order for him to carry on losing the weight, you just need to be as patient and supportive as you can. The weight isn't going to come off overnight and it can feel really daunting and depressing when you think about how long a haul it's going to be to shift it. He needs to feel supported otherwise it's easy to get depressed and jack the whole thing in.
Can you think of some non-food treats that you can get for him (or do for him) along the way? Maybe for every half a stone he loses? Just to keep up his incentive and let him know that (a) you're behind him and (b) you value him. One of the worst things for me about being so large is that I feel that society places very little value on large people - we're seen as lazy and stupid, judged by the label in our jeans rather than by the things we do and say, and I find it really important to feel valued by my dh.
Would he consider doing something like Weight Watchers? Getting outside support might be useful to him. Or maybe he'd like to come and chat on this thread with us - he wouldn't be alone, we already have one man who posts here.