In response to the original question here about crying during a PTSD flashback - YES. In fact it it the single most disabling symptom I have, and it's what caused me the most problems at work.
I have a very hard time with authority figures, and with peers who "have the ear" of someone in authority over me. Any time I am unjustly accused, put in an impossible situation, shouted at, humiliated et cetera, my initial response is anger, which instantly turns into inconsolable crying that lasts for hours. I am unable to stop, and it gets worse if someone tries to comfort me! This has been my downfall in my career - it has happened at every single job I have ever had. It's so embarrassing and it leaves me even more vulnerable to abuse by the opportunists who see it, and use it to their advantage.
I have NEVER seen anyone else do this, and it's the thing that has made me feel most alone. There is absolutely nothing that will make it stop once begun, despite 25 years of psychotherapy. It's like a seizure that can occur unpredictably and has to run its course. It used to happen maybe once a year, but became more frequent before I had to stop working. I think it was a vicious cycle - it would happen and coworkers or supervisors would lose even more respect for me, which caused them to treat me badly, then they would get away with it, and others who previously wouldn't have dared to be rude to me then felt they could get away with it, and it was all OK because anyone could just say that the problem was me, since I'm emotionally unstable. Awful.