The PTSD list of symptoms are just a guide. One doesn't have to have every symptom on the list to have this.
There in fact are new studies that have come out that say child abuse, and rape have higher incidents of PTSD than combat duty. A lot of times you don't always know why you are triggered, and a lot of times it has to do with something that has happened in the past.
There are many causes of PTSD,one just being a witness to violence or personal loss (like 9-11) on TV even. If you have most of the symptoms for quite a while, you probably have PTSD. I would get checked out by a doctor or a therapist.