Oh dear nevergoogle. I feel your pain, I really do. I've plastered it all over MN that DS's birth was one of those shitstorm ones that left me with a bunch of problems after.
I've had all kinds of therapy, and thought that i had a good handle on things, and some days, I really do.
And then I was having coffee with some of the mums after preschool drop-off and someone asked if I was having more kids, and I said my usual, "no, too much went wrong when I had DS, he's it for us". The mum who'd asked said "oh gosh, what happened?" and for several seconds I had to really fight with myself because my brain went on lock-down and my body wanted to hyperventilate. I got it under control without making too much of an arse of myself, and everyone was kind enough to say "well we're here if you want to talk about it" fuck no so at least they don't seem to think I'm too much of a nutjob.
DS is turning 4 in Feb. I feel the same as you - seriously, I've done all the friggin' work, can this please not just get out if my head???
I've had to have two repair ops since his birth and for one they gave me the option of a spinal and I just about came undone. Having a knee op on Friday, asked surgeon if he prefers spinal or general anaesthetic and he said, "oh definitely, general, most people wig out a bit over spinals" :o - but man, he couldn't know the half of it.
It sucks. I hate PTSD. I talked to a psychologist last year who said in her opinion, PTSD never really goes away. You learn to live with it. You're triggered less over time. But it's always there, and sometimes it ambushes you. Cheering thought.