First and foremost, your former employer sounds like a tool who doesn't care about the health of the people that help his business grow. "It is not allowed behavior." There is lots of stigma with PTSD and other forms of mental illness, so I'm sorry that you experienced this. I also can't blame your employer alone, because he's not the only one to think like this, unfortunately. I too, had this experience, except, I never told them I had PTSD -- I left, because I knew that if I was honest with him, he would have done the same thing.