I can understand your anger.. especially regarding the bad experiences, and then coming here and being told essentially that "no one can diagnose you other than those qualified to do so".
My personal opinion is this: Nobody but a professional SHOULD diagnose you with PTSD. It's a serious, debilitating mental issue and there are so many complexities, it's dangerous for just anyone to be able to say "oh, I have PTSD because blahblah" and then go off and fix themselves based on things they read. Obviously some of the replies on this thread, and this forum in general, show that people understand things they read in different ways and interpret in different ways, and this can get really dangerous for both that person and others around them. So yes, I agree that nobody but professionals should diagnose PTSD.
However, I also believe - and obviously so does everyone here, including Anthony, otherwise he wouldn't have made this forum - that to really begin to heal from PTSD you have to be willing to help yourself. There are many, many people here who haven't been "officially" diagnosed but they are here, talking, asking questions, researching, learning more and trying to understand themselves and how they can make things better. I see nothing wrong with that. I think it's wonderful that there are ways that people CAN self-educate and self-help. I just think diagnosis specifically really should be left to those who are trained to make those diagnoses.
Or maybe a simpler way to put it - you came here hoping to deal with symptoms relating to trauma - i.e. post traumatic stress; but to get the official diagnosis of Post Traumatic Stress Disorder, you would need to see a psychiatrist/psychologist who can give you that official title.