This all sounds as though it's really valuable reflection @creative_writer
I think those wonderings about our brains trying to convince us that we have more control sounds about right. After going through such a loss of control it's natural to cling to any idea of having control, even when it's ultimately harmful and places unfair responsibility and blame. If we tell ourselves it was something we were responsible for then at least we don't have to experience the fear of helplessness.
I also totally agree about finding a new psych, it can be so daunting and it's exhausting telling your story all over again, so while you can always hop around and find who's right for you, that process can be pretty mentally and emotionally draining. I'd say it's ultimately worth it, but I hear you, it's daunting and can be rough. I recently switched because due to scheduling conflicts I could just never see my old psych, and something that really helped me choose was going with someone who offered a free 15 minute intro call so I could ask questions and get a better sense of how I felt with them. I know it's not offered everywhere but maybe it could be something to look into?