I have PTSD, severe PTSD. Not because my son died, but because of how he died.
I suspect that being a support person to someone with PTSD is one of the most challenging things. Speaking from my experience, I'm moody, and can't make decisions even the smallest ones overwhelm me. Flashbacks often consume, and make it imposdible to be a good friend because I'm too stuck fighting for my next breath. I detach in a bad way, and because of that I seem rude and mean. I struggle every day. I often default to being numb, which leaves me feeling cold to those who seek my care(though I work my butt off to make sure my kids don't deal with that piece). Without intention I push people away. I isolate because I don't want to hurt those who matter so much to me. So instead of asking so much of them, instead of asking for help, for patience, for compassion, for endless amounts of forgiveness, Instead of all of that I stop talking. So yeah I imagine being a support person for someone with PTSD is pretty miserable.
I hate this.