Usage patterns
〈人〉が医者になるto become a doctor
He says he wants to become a doctor in the future.
医者に見てもらうto have a doctor examine (something/someone)
Since my fever wouldn't go down, I had a doctor examine me.
医者に相談するto consult a doctor
Please consult a doctor before taking the medicine.
Expressions
医者に掛けるentrust to a doctor; have a doctor see (someone)