Just throwing this out there in case anyone has any thoughts on it. Schizophrenia simplex/simple schizophrenia is a controversial diagnosis (In the US where I am it's not recognized, but is still in Europe) of a form of schizophrenia with no positive (hallucinations, delusions) symptoms, only negative symptoms which naturally overlap quite a bit with Schizoid Personality Disorder: https://en.wikipedia.org/wiki/Simple-type_schizophrenia
The main thing that stands out for this is the description of an early onset and gradual deteriorization which describes me very well. I was never an engaged social person but I do feel like I was functioning to a much greater degree and have been getting worse very slowly, year after year. When I was 12 or 13 all the adults around me seemed to think I would be the next Bill Gates or something, and even though this seemed to start around that time, I managed to get a full ride college scholarship, but then ended up dropping out as I got worse. Also my mother has pretty severe paranoid schizophrenia. I've seen a psychologist and psychiatrist after being prodded by family continuously about it because my situation has gotten worse and worse, and the diagnosis was Schizoid Personality Disorder with comorbid depression, which hasn't had much response (other than a great couple months on one combination that pooped out, where I felt almost like I did when I was a teenager again) to medication. Unfortunately, even if this is what's really going on I'm pretty screwed as treating negative symptoms is a crapshoot at best from what I've read.
I'm wondering if this is really a legit separate syndrom or just some artifact of medical classification and both SPD and simple schizophrenia basically describe the same mental state. Has anyone else experienced this kind of a steady decline? Do you have a professional diagnosis at all, not that that necessarily will be accurate, but just curious?