'I'll be honest, I increasingly don't think psychiatry is real medicine.'
I would like to respectfully disagree with you on this.
Rather, I think psychiatry is an imprecise area of medicine. A lot of that is to do with the fact that for most of history, we have been going in completely the wrong direction in terms of treating psychiatric illnesses. Any understanding of how the brain works has been a fairly recent development.
For a lot of history, all you could do when someone has a really serious psychiatric illness, when people weren't doing something horrible like torturing them or burning them as a witch or whatever, all you could realistically do was try and limit harm from the symptoms.
E.g, margary kemp was a woman in the medieval era, who suffered from postpartum psychosis. She actively was trying to harm herself and end her life, even by biting herself when she could not access an implement. To prevent this her husband restrained her, and tried to maintain basic needs (e.g food/water).
In the modern era, this treatment would seem barbaric. You could give antipsychotics, therapy, maybe sedatives rather than literally tying her up. But at the time, with the technology and resources avaliable, that would be the best anyone could possibly do.
Then for a lot of the 20th century, people were doing actively harmful stuff like lobotomies.
We've generally been moving in the right direction in terms of psychiatry since some point perhaps in the 80's? So that's a pretty small knowledge base foundation to be working off, only a couple of decades, vs other areas of medicine. E.g, we've been doing trauma surgeries for thousands of years.
Its also very difficult to find out how some well interventions work.
You need a control group with no intervention to see how effective an intervention is.
e.g If we do a randomised controlled study on how effective anti-depressants are at treating suicidal people, and give some people placebo pills, if the anti-depressants are helping, some people will probably have to die to get this information.