You raise a lot of good points, @amandalouise, so thanks for that!
I will concede a lot of the stuff in my second post (and about my general disposition) isn’t PTSD reactions, though I do have some triggers, most seeming to be related to stuff that has happened with/been done by close family members.
I was diagnosed with high functioning autism at 17 but have always kind of questioned it since I found out. My counsellor initially agreed with the diagnosis, but after a while said she’s not really seeing it in me - I do know PTSD and autism symptoms can overlap and you can have both as well, however. So, I think another assessment with a trauma/autism specialist may be in order at some point, to parse out whether it’s just trauma or if I really am on the spectrum.