What are the signs of PTSD?

Well I am definitely not a professional. However, I have been diagnosed with PTSD. Some of your symptoms are similar to mine. Also from what I understand PTSD can be dormant and emerge years later or whenever you encounter a trigger. For example my triggers are loud noises that resemble gunshots or flahing lights that resemble muzzle flashes. Once again you should talk to a professional because only they can really tell you for sure. But if you are having nightmares regularly, flashbacks, trouble sleeping, anxiety and depression there is a good chance that it is PTSD.