Firstly, I would suggest seeing a psychologist, psychiatrist, or some kind of mental health professional -- not a GP, and preferably someone with a Ph.D because in most states, MA's (many therapists hold just a masters) can't diagnose. Medical doctors are great, but they just don't have the specialized education in mental health that you need.
Another thing I would do is write down a list of all your symptoms, and make sure to explain that you think they are related to the trauma you experienced (even if you can't talk about it) and tell them why- tell them you feel you can't talk about it, and that's one of your symptoms. Tell them why you can't talk about it, what you feel on the inside if you try, or when you think about it.
And I think the most important thing for getting doctors to realize that you need help, not just a break, is to emphasize how your symptoms are affecting your life. That's usually the major requirement for a diagnosis, that the patient is feeling both distress on a regular basis and that the condition is impairing your life in some way. An example of impairment would be avoiding certain activities that you would normally do or that you desire to do, but you can't because of an anxiety reaction or something like that. Also, things like nightmares that keep you from having restful sleep on a regular basis would be considered impairment.
The way I see it, you just have to be able to communicate to the doctor that you are really experiencing distress and impairment in your everyday life. If it helps, write it down ahead of time so you don't forget to say anything you wanted to say.
Does that help at all?