This is why they call medicine a practice, and a dx an opinion. There's a lot of science and fact, but the big picture is often an educated guess based on best available information, experience, and sometimes even a hunch or two.

Yes, I have had this happen to me - several times. There's even an old joke about it (sort of).*

Since the doctor that you have trust & confidence in had some concern about you/your treatment and sent you to the teaching hospital, what does she think about your going through with the additional tests?

From my own experiences, I'd try to have a discussion with both doctors (separately) and try to find out what's up. What are they trying to determine or rule out, what are their concerns & why, etc. I wouldn't be confrontational, or try to pit them against each other (that may shut them down or cause them to put up a defensive wall), but I would be firm about wanting to be informed and involved in my care/treatment. Then I'd probably list/consider the pros & cons (upsides/downsides, benefits/risks).

Since it's a bit of a distance (or maybe just becuz) I might go over that last part a couple times (i.e. sleep on it) to see if my answer changes or I needed more information.

HTH,

Doc

* http://neurotalk.psychcentral.com/post705387-32.html