Another request for title

You guys rock!! I have been able to revisit all of my favorite horror classics because of you.

here's one i can get out of my head:
a trilogy.
some wierd guy telling tales
one of them involves a man getting attacked by a fierce dog at a gas station. the man has to abandon his car and seek refuge in the mental asylum across the road. In the end he realizes that all doctors and nurses are actually patients and the actual doctors and nurses have been killed.
two more stories i cant recall


thanks in advance