Oh, it can be hard to help a spouse that is battling ptsd. He needs to understand he just can't fix her and all he can do is help her to feel safe while she is clearly been somehow triggered into really struggling with it. There is a lot of frustration and anger when struggling with ptsd. She can be in a stage where she is so tired of struggling with it that she gets angry and tired and may take that out on him.

He should find a therapist for himself that he can vent to and that may be able to help him understand it better and help him develop his own ways of gaining his own breaks and space from her that will help in keeping HIM healthy. It's not unusual for a person struggling to need to see more than one therapist until they find a therapist they feel is a good match for them.

What country does he live in?