Hi Blownaway and welcome to the forum.
I am a little pressed for time at present but suggest you start reading here
http://www.ptsdforum.org/forum43.html.
Unfortunately, while everything has been a shock to you it is your husband who now needs to come to terms with his condition and to learn how to manage himself which can be a long and slow process. If you choose, you can support him and I hope you do. The best thing you can do is arm yourself with as much knowledge as possible and hang in there as it can be a bumpy road.
Good luck and once again welcome to the forum.