It's crazy! I never realized I was anxious until I started anti-anxiety meds.
Modern mental health is pure quackery in my experience so far. It's been "let's try it and see what happens"
It’s the same with all medicine. Pain medication, antibiotics and so on. Doctors try stuff until something works. You may have overly positive views of science if you don’t think it’s being made up as we go. The body/mind split is artificial too.