A mouthful of pain

Currently suffering through a terrible dental experience.  Went to a new dentist a few months ago for a routine checkup, and he managed to fill a small cavity too deeply, placing the filling right next to a nerve.  Really nasty pain in that tooth ensues when there'd been one prior to the checkup, and I naturally end up having a root canal done.  I go in this morning for my 8:45 appointment for a temporary crown on that tooth and I don't leave until roughly 11:30.  And the temp crown falls off within 40 minutes or so.  So I now have to go back in tomorrow morning.  Here's hoping I don't spend another 2-3 hours there, but I think the problem is that the crown is too big.  I wasn't able to close my teeth together after leaving the office, and while I wasn't consciously rubbing against the crown I think the fact that it's the first contact my upper teeth make when my mouth is closed is going to be a problem.  So I have to convince the dentist to make a second mold, for which he's probably going to try charging me.  Fun, fun.

Probably goes without saying that once I get this crown done, I'm switching to another dentist.