When I had a diagnosis, I will echo Fish's statement. Things moved along very quickly. I didn't get out of the doctor's office before I was referred to a cardiothoracic surgeon and sent away with a handful on new perscriptions and a lot of special instructions.
If it is serious, they tend not to screw around. They move with the urgency one would expect when it is something serious. I totally understand how it would set you off, as it would set me off as well, but if it were something deadly, I would fully expect them to keep at it.