most sources do not claim PTSD as a mental illness.
Seems odd, then that DSM stands for Diagnostic and Statistical manual of Mental disorders...
Personally, I don't have a problem with mental illness - I was diagnosed a depressive before PTSD. If you are speaking more philosophically, that's fine. Otherwise, saying it's not a mental disorder seems to me like giving in to shame, wanting to avoid the 'mental' label. Many mental disorders have biological/physical origins. And, they are experienced physically.
it is reality based and there is no actual psychosis.
This would therefore mean that psychosis is somehow not based in reality. I think I understand what you are trying to say, but you are combining concepts in a way that strikes me as unnecessarily convoluted.
Yes, PTSD is a result of trauma - a real, not imagined event. But many other mental disorders are the result of real, not imagined causes. What is the true difference between cause and event? No, PTSD is not a psychotic disorder. That's a classification, holding schizophrenia, schizoaffective, delusional, catatonia, I'm probably leaving one out.
PTSD is a trauma and stress related disorder. It's not identified by the DSM - or by the APA - as being in some completely other category that is 'not really mental illness'.
There is a lobby to change the name, and remove the 'disorder' moniker. The reason given is that it causes discrimination and adversely affects the sufferer, who should not be labeled as having a disorder, but rather, an injury. That more people would seek treatment, feel less shame and stigma.
I am of the camp that believes that the effect of PTSD can be identified as a physical change to the brain, and that said injury occurs at the time of trauma. That's not a proven medical fact, but I'm a believer in the research. So conceptually, I think I'm completely aligned with your point of view,
@Muse.
But, as a person with Depression, which - last I checked - is not due for a name change anytime soon, I wish that people didn't think the road toward destigmatization of PTSD has to do with changing it from a disorder to an injury. And certainly, insisting that it's not 'mental' because it has a cause in reality - that's just mixing apples and oranges. Schizophrenia is understood to have just as organic an origin as PTSD does. A major depressive episode is presaged by an inciting incident, often some kind of emotional shock or crisis.
/end soapbox