I agree, even though like you, I tend to agree that what you have is most likely PTSD. There are no two minds that are exactly alike, and no two PTSDs that are exactly alike.The worst thing in the world is to be in pain and not receive the help you need, and feel invalidated because people disagree about a diagnosis which is basically just a label... the important thing is that you receive the correct type of support for the symptoms you are going through.
Getting help from a competent psychiatrist would likely be the best way to go.
But it's the same thing though! When the OP heard the news of betrayal, maybe there was water running at the moment. So now running water will trigger her and make her cry and freak out. The mind is stupid, it's just what it does.The way I distinguish it in my head, is that PTSD is caused by something terrible happening that is out of the ordinary of day to day life. The something terrible was so terrible that it caused you to experience intense horror, fear and helplessness.
It's like the difference between finding out that your friend has died in a car accident vs. being present in the car with them and seeing the sights, hearing the sounds, smelling the smells of accident with the body of your dead friend lying slumped in the front seat next to you.
See what I mean?