Welcome Rob, as Red and Sludge said, we all suffer similar symptoms, but it does become manageable with the right treatment. I used to explain it to FNG's like this.
Learning to manage PTSD is like learning to surf.
When you first start your barely able to stay on the board let alone stand up, some people can though but that is not usually for long. You get all the right gear though, a good board, the right wax, a good quality wetsuit etc, but you look like a complete idiot getting dumped all the time, you get scraped along the coral and get stomach fulls of water.
There seems like too much to do and too much to remember. Don't take that wave because of the way it's forming, make sure your feet are place right, don't over balance, etc, etc.
In time you manage to stand up every second wave and you start to enjoy it. After heaps of practice and numerous waves you are starting to be like a real pro.
But as every surfer knows, it does not matter how good you are, you can always be dumped.
So with PTSD, you can do all the courses, read all the books, take all the right medications, but at the start nothing seems to work. With time though and practicing what you are taught, you can actually manage to go out in public and go to BBQ's with your mates. You will actually laugh again and fine enjoyment in things. You will even be able to tackle shopping centers.
But no matter what, there will always be days, and sometimes weeks where you will feel like you have been dumped and feel like your back at the start again.
It get's better mate, it's just a matter of time and patience.
To put it in the military perspective, if you wanted to take a village full of insurgents who had heavy firepower, there would be heaps of recon, heaps of practicing drills, etc. Some missions will go without a hitch, damn, you might even manage to go a whole month without a single WIA, but there will always be that mission where something goes pear shaped.
I will stop waffling now.
Jimmy