Well as the nature of trauma goes, one thing leads to another. My dad was a horribly abusive person, more of a monster than a man, and I think some of that abuse can be attributed to the untreated disorders he had (autism, ADHD, auditory processing disorder, dyscalculia, dyslexia too but I have that it's a mild case). So he genetically passed those down to me. And the trauma he caused me from abuse broke my brain, leading to most of the others (PNES, MDD, C-PTSD, BPD, DID, AVPD). There are also some I just picked up along the way, like gender dysphoria because I'm trans, body dysmorphia which is common in people with BPD (and ofc led to the anorexia), and for some reason tourette's, although I think that one was onset by taking stimulants for ADHD when I was 17. Even POTS is caused by trauma. Damage to the nervous system, illness, enduring abuse, accidents, all of those can cause it. And boy have I had most of those. It really is miserable. Even with all of the coping mechanisms I have, I don't think there will ever be enough time and treatment for me to be able to live a comfortable life with everything I deal with.
Oh I just realized I forgot to say, but a lot of them have been diagnosed over time and by different providers. So I didn't have just one or two assessments and immediately get it all dumped on me. It's been a long, painful process of reckoning with all of them. And there still are some that are technically undiagnosed, although my providers agree I have them, such as autism and DID. The only reason they aren't officially diagnosed is because it could affect my ability to access my HRT and gender-affirming care :( sucks, but I'd rather have that than a little diagnosis in my chart saying I have a thing I already know I have.