Whilst I too have had this problem, and still do to a certain extent, I thought that I would give you the views that my dh had. Although they are not the same as ours, they may go some way to you understanding your dh. They will never make sense to you or me, but then I don't think that men ever understand women, and vice versa.
After having ds, I was only about 7lbs over the weight that I was when I fell pg, but that was about 2 stone over the weight that I usually like to be, as I had needed to lose weight before falling pg. My dh obviously didn't find me attractive like that, and it caused some arguments. However, he explained it to me that he had married me a certain way, and although he still loved me the person, he didn't find my body attractive. It was upsetting for me at the time, and he admitted that it was shallow.
I think that men often feel this way, and it is the rare man who actually does not try to keep on to his young slim wife. Women love emotionally, and love their man for the person he is. Unfortunately, it seems to me that when men fall in love, it has some element of fancying the woman too, and those feelings are irrevocably intertwined.
This is not said because I empathise with how a man feels, but because I have sadly had experience of it. I don't know how you can change this, but don't let it affect you enough to fuel your disorder. My ds is 14 months too, and I know that I still have days when things feel too much for me, as you will see if you read my self-indulgent posting 'Cross with dh...'
Do you do many things just for yourself i.e. nights out with friends? That might make you feel more self worth. I have recently signed up for an evening class, and am really looking forward to it.
Re your dh, all I can say is, as others have, have a chat in a non-confrontational manner, and try to explain how you feel. If he is worth anything, he will try to understand. It sounds like he might be trying to help, but in the wrong way - men do that, as they hate having a situation that they can't control.
Sorry that this is so long, and I hope that you feel better soon.