I'm sorry you have to see a loved one go through it. Sometimes I really think it's harder on those around you than the person that actually is suffering from it. It sounds like he (and you), have been through a lot in life and his reaction sounds pretty understandable. Men get PND too and a having to adjust to a new baby when you are already emotionally fragile is probably not easy for him.
No advise really, just to love and support him, he will need you soon. But you can't force him to do anything until he is ready. Just take a deep breath and wait. I'm so sorry you have to go through this.
U might think this is stupid but, would it help if you were to show him your original post? Its not really negative to him in any way and it sounds like you have been fair in what you have said.. and he will perhaps be able to see what you see.?