My experience is the total opposite. If I claim I have something, they will be very critical to the idea and really try to explain it away. That is why I never mention what I suspect, I only talk symptoms. The only time I actually presented my self DX was when I speeded an appointment up because all I needed was antibiotics for Lyme, so I said hey I have Lyme, I got bit by tick this and that many weeks ago I saw the tick I removed it and this is the rash. He agreed.

I would never dare doing that with a more complex DX.