Meant with deep kindness.
And yet? That, right there, is grief. The kind of grief that can drive men mad. Unending, unendurable pain, and loss, and despair.
If it were "just" PTSD? What you would be treating was what you were there for. When it wasn't finding out that your son was dead that gutted you. It was losing your son.
Prolonged Grief & Complicated Grief related to Bereavement, found under Adjustment Disorders (and are proposed for further study as their own unique disorder in further editions) that do
exactly as you describe. They're very similar to PTSD in many ways. And very different.
You may also have PTSD from other events in your life. And grief is a helluva stressor that can kick over Pandora's box, and keep you from grieving your son at all, because your past has knocked into you like a freight train. Or may also have MDD in addition to. If so, that means treating both. Or all 3. Or whatever combo it is that creates the unique key to fit the lock between your heart and mind, and returns you to yourself.
"Just" treating PTSD? Wouldn't even begin to touch on the loss of your son, nor what that means to you, nor how soul shredding & life destroying such a loss can be. Regardless if he was 5,000 miles away. And if in PTSD it's "just" a stressor, while in Grief & Bereavement his loss is CritA, the central component, and the single most important piece.
If you have PTSD, you might not be able to focus on your son, or grieve him, until you sort your past. If so? I am so sorry. So very sorry. He shouldn't have to wait, nor should you. My
hope is that if you have both PTSD and prolonged/complicated grief, that the PTSD can STFU and wait until your been able to grieve him. That's not always the case.
Very strongly agreed, get help & do it now.
COMPLICATED GRIEF AND RELATED BEREAVEMENT ISSUES FOR DSM-5
How the DSM-5 Got Grief, Bereavement Right | World of Psychology