All of that which Sqad says may well be true or eventuate. Only time will reveal its turgid tale.
Sqad.... You, or the 'he' you refer to, may well take that method of approach in your hypothesized-usurpation. 'She' may not.! Were a doctor, of any gender, to make such an exclamation to homedeeth, or anyone, in accordance with their putative imprimatur_ regarding 'prescribing'_ a proscription, patient-dinted, is optional. Any doctor that would 'advice' [as you put it Sqad, ipse dixit], and not 'advise' [as I would put it, and do so] some treatment, might best be given a wide berth. In this instance it could be perceived that more circumspection is warranted towards not that which emanates FROM nasal passages, but that which does, and tends to, get UP there. P'un_invited...
homedeeth... I 'advise' you to see several doctors if your first visit doesn't obviate it. Chances are, you'll receive as many diagnoses as seen doctors. Especially so, if you make no mention to each doctor that you've seen other doctors regarding your ailment. One mustn't forget that a qualified doctor is given licence to 'practise' medicine. They're not infallible, they're human beings, and will learn as they proceed, if their heart's really in it. Once again, good luck, and best of health to you. Allan.