I hate when doctors do that. Please, please. I know it's hard, but try not to freak out over this unless or until the test comes back and it is actually something bad. Even then, I am confident that you will be able to handle it and find a way to cope. I'm sure he wasn't really trying to scare you, but doctors sometimes lose their social skills when they deal with the public. If he is an otherwise good doctor, try not to hold it against him. But please don't let him fill you with fear and worry, either. Life is too precious to waste on fear of the unknown and doubt.
Again, please. Let the future take care of itself. Worry won't give you anything but heartburn; and I have rarely found that to be helpful.
Have a kind day,
Annie