My husband had PTSD when he came back from Iraq. Like you, he was VERY good at hiding his true feelings for a while, but eventually, the facade came down and when it did...whew. We nearly split up before things started getting better.
What helped him (is helping him still) is a therapy technique called mindfulness based stress reduction, or MBSR. You can google it for more information. He participated in a study at Emory University and was such a poster child for the success of it that he's being interviewed for magazine articles and documentaries about it. He was on NPR a year or so ago, too.
We're Christians, and at first thought it was maybe too "new age" for us, but the way it was presented to him, it wasn't that way at all. It taught him how to break out of the mental spiral that he went down when PTSD struck, how to refocus on the moment and not "go back" to where he was when the traumatic situations occurred. It truly has helped.
I wish you the best...it's a tough thing you endured.