Both of those structures are fine, but they do not address the text unless the doctor is a lady: the doctor, not the 'lady', is being helped by the postman, I think. According to the doctor, what should the postman do to help him? According to the doctor, what should the postman do in order to help him?
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Mister MicawberAccording to the doctor, what should the postman do to help him?Hi Mister Micawber,
According to the doctor, what should the postman do in order to help him?