How long were you over there?
Maybe since your were there for an extended period of time, and always in a state of defense, and even while sleeping, your brain is still in that mode. I dont know but that seems like it may make some sense.
I think Therapy would really benefit you, whether thru the VA or thru other resources....
My suituation for PTSD is very different, however some of the issues you are facing with fear and sleep or lack of, are exactly the same.
I faced a different type of trauma but it was over an extended period of time, years, and it was at night, while I was sleeping.....
You likely were sleeping but always in a half concious state ....always ready for whatever situation that could happen without notice....
Just to relate....
I wake up several times per night in a jolt, or panic ...basic fear but I am not sure of what...though I know why it happens ...its in my subconcious somewhere and that is why I am dealing with it through T (therapy).
Also because I feel this way, and I am tired from it, it causes other issues like depression, aggitation, and anxiety.
So in addition to the T I have had to accept help (temporarily so far) through the use of Anti Depr and Anti anxiety meds...
I hope this helps a little...
I really hope that you can get some positive help and feedback and that you can find some reliable help through the resources that are out there.
My only advice other than to keep writing and releasing the tension and feelings you have here on PC, is to not wait or delay getting more help.
I waited 20 - 30 yrs before seeking help from people who know how to break it down and help me deal with the PTSD...that is much to long.
I know someday my life will be very different than that which I have experienced so far....including how I cope with these issues.
Mainly because of the help, teaching and direction I am learning from people who are helping me...

I prob repeated myself several times here. srry for that.
Have a great day