I would have punched the doc out right in front of everyone. If you're a doctor you're never to say you don't know what is wrong with someone. What you say is "We need to run a few more test to make sure our theory on what is wrong is right." that way you sound like you know what the hell you're doing even if you don't.
On a good note I'm more then happy to hear that Matt loves Zack
I really hope Matt gets his memory back soon. I have to agree with Johnny on this, I'm not sure Zack is going to be able to keep shit together much longer.