You might consider that there might be something other than PTSD or something in addition to PTSD going on here. Does your wife know she has a problem? Does she know she is hurting the relationship? If so, does she want to fix it?

I have PTSD and I can get into quite the foul mood but I still know that I don't want to hurt my husband. When I see that I have caused him pain I feel very poorly and we talk about it. He is one of my driving forces to get better because I love him so much and I REFUSE to let PTSD get in the way of what I have with him. Yes, it takes work, but it CAN work and nobody has to take any abuse.

A marriage requires effort on the part of both people. If she isn't making an effort then you might ask yourself why she wants the marriage. Is it for the right reasons? There are some hard questions but at some point you will have to answer them together in order to move forwards and be able to agree on some boundaries and other things like Cowgirl mentioned.