Welcome Home Brother,
That's an important statement for you to believe and accept, that you are welcomed back to a grateful nation, as a returning Warrior.
If you have not been debriefed by the military, it's very important for you to get help. Vet Centers are a good start. Talk to a counselor there. He'll probably suggest one-on-one or group therapy for you. Take it, it's very important to be able to put the trauma behind you as soon as possible. It only gets worse if you don't.
You've arrived at a very good place online to learn, and it's only limited by your willingness to believe. It's also important for your family to learn about PTSD too, so they can understand what PTSD is, and how to give you the support that's necessary for you to feel REALLY "at home" again with them.
Respectfully,
WarHippy1%