Mouse, you shouldn't be so hard on yourself, because the job you do, puts you in the firing line to see the worst of life itself. The car accidents, pulling bodies off roads, etc etc. I dare say that the incident you mentioned in regard to your father, really has nothing to do with your actual PTSD itself, but more was the one that sparked the flame, or the catalyst as such. In emergency roles, police, fire, etc, PTSD has often began to form a long time ago, often within the first couple of years. Some develop PTSD itself, some do not. That is one of the hidden secrets still at present, which some clever doctors with some pride in healing humans are working upon for us.
Mouse, generally in the case of your type of work, the road to healing is a long journey, because you will have so many memories off attending traumatic scenes, the lists are often extensive. So as farmer said above, certainly not pitiful at all. You should give yourself more credit for the type of work you do, the things you do, because you deserve that recognition, especially from yourself.
Mouse, what you can tell me about the dreams? Are they from accident / incident scenes? The remembering part is two fold, in that what we see at the time, and what actually is caught by our eyes and immediately stored in our minds, are two different things. The second aspect is that PTSD itself, and our minds, often go adding bits and pieces into our already horrific lists of trauma, because it rebuilds stories for us, in that it uses this to help gain momentum over us, for our mind to win and PTSD succeed.