Sorry to hear of your troubles. I'm in almost the exact same situation you are - and for the same reason. My husband came back from Iraq an entirely different person, and it took him two years before he would see a doctor about it. I understand being exhausted. Do you have children? I've found that, at least with my husband, it helps to get out and do something active that has nothing at all to do with the military. If we're at home he answers his work phone, watches tv all day, and plays video games that bear a striking resemblance to the situation that caused this in the first place. I bought a season pass to the zoo and we take the kids pretty frequently. That seems to help, at least temporarily.
The problem I'm having now is that, like you, I'm having trouble feeling like I'm worth anything. Of course this causes problems because I'm somewhat withdrawn and he thinks it's because I don't want to have anything to do with him.
I wish I knew what to tell you, but unfortunately if I knew the answer I wouldn't be venting on this forum every so often. Still, my thoughts go out to you and your husband. Hope things get better for both of you.