Earlier quoted context omitted.
Just a side note for anyone reading: you can get an SSRI prescription from your GP (general practitioner i.e. normal doctor) you don’t need to go through a psychiatrist. This is especially true if you are at risk for withdrawal, they will want to prevent that.
any medical doctor of any specialization can legally prescribe anything. that doesn't make it a good idea. a piece of supporting evidence is that the doctor's malpractice insurance may not cover any "cowboy" prescribing tendencies.
I wouldn’t advocate you get a prescription for antipsychotics from your orthopedist, but SSRIs from a GP is probably pretty safe.
Obviously, it depends on the doctor and the symptoms. But a good GP will also refer you out to a specialist when needed. That’s a big part of their job: assessing when to call in a specialist.