I have Complex PTSD diagnosed by a professional (it's a legit diagnosis over here, ICD-10 has slightly different criteria than the DSM IV TR/V).
Not going to go too much into it, but I had a very rough childhood with an abusive alcoholic father, nasty bullying at school, and I was raped in college. It took over a decade and luck of the draw before I got a case worker and therapist who figured out what was really going on (both did a lot of work with refugees and picked up on my behavioral cues immediately). I'd been going on and off to therapy since I was in grade school and my mom suspected I was being molested, each time I got a different diagnosis but nothing really helped.
I'd been having flashback and dissociative episodes as far back as I could remember, but I had no idea that that's what they were since the pop culture representations of that stuff is so combat-veteran based (especially in American media, which we get a lot of) that I never put the pieces together.
Now I'm 3 years into regular therapy, including using ACT and EMDR and I'm getting better. I can recognise my triggers, and instead of almost daily flashbacks and dissociative episodes, I get one every few months. I'll be "graduating" regular therapy this fall. Not sure of when I'll stop taking SSRIs, but we've even been able to lower my dose.
I just want everyone reading this to know, if you or a loved one has PTSD or the symptoms, therapy works. You can get better. It's not easy (EMDR or any other exposure therapy will make things worse in the short run) but it's worth it.