In the USA you need a psychiatrist to diagnose PTSD as it is a medical diagnosis. The DSM is much more than just a check list, and therapists aren't trained in diagnosing patients. I am not saying that you don't have PTSD, rather it is a good idea for you to see a psychiatrist who can properly diagnose you. I'm a little wary about linking PTSD to passing out, as that's not a part of the disorder. Perhaps it would be linked to a more severe dissociative disorder, but of course that is speculation.