Honestly, she's making excuses to stay in control, and you're letting her. Having PTSD shouldn't be something you feel bad about. And she's the one making you feel guilty for something you can't control, and are working on. If you want the marriage to be healthy, you have to gain confidence about yourself, and stop letting her hurt you and keep you under her thumb. What she's doing to you is manipulative. You don't need a divorce - you need to see what she's doing to you for what it really is, and take control. Stop taking her shit, and start making healthy demands.