In response to the OP.....
The problem that I have found with soooo MANY doctors----ALL kinds, but not ALL doctors----is that no.1, they often suffer from a "God Complex". They think they know-it-all, no.2, because they've studied for so many years.
Well, guess what *I* always say.....
"Life ain't IN a book", no.1; and, no.2, "If non-fiction books were all-facts-all-the-time, man would not have had to invent the term 'revised edition'"! !
Then, given the fact that you said he's insecure..... See, sooooo MANY people feel that education is the "be all / end-all"----he thinks, it seems, that his education "validates" him. Well, he'd have a RUDE awakening if he read this thread----cuz, it seems, NOBODY here has 100% faith, in a doctor. Education can't "make" a person----it can ENHANCE a person's brain----but, not make a person "good", for instance.
Then..... The fact that you're YOUNGER, makes him believe (as my older sisters do) that he's, like, "King of the World", or something----that everything is OWED him, because he was born BEFORE you!! Well, just as with my older sisters, birthright, does NOT mean "brain-right"----if ya know what I mean!! Age, IMO, has NOTHING to do with "smarts" / intelligence / whatever!! I've seen people who were 17, 18, 19 years old, with a VERY good head on their shoulders----and, I've met 50 / 60-year olds, with not a brain in their ENTIRE body!!
Also, you're a FEMALE----and, as much as I'd like to believe it no longer exists, the fact IS there's still ALOT of people who view females, as the "weaker" / "lesser" sex.
Then, given the fact that you feel he might be narcissistic----oh, geez, I don't EVEN want to open this can of worms, AGAIN, this week----but..... All bets are OFF, with those people, IMO----I'm dealing with it, myself..... Yep, you guessed it----my older sisters!!
IMO, stick with the advice / diagnosis, that you got----there's a REASON it's unethical for a doctor to treat his own kin!!
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White female; age 59; diagnosed Aspie.
I use caps for emphasis----I'm NOT angry or shouting. I use caps like others use italics, underline, or bold.
"What we know is a drop; what we don't know, is an ocean." (Sir Isaac Newton)