Final answer:
The doctor's reaction to the statement cannot be determined from the provided information.
Step-by-step explanation:
The doctor's reaction to the statement 'You're only as sick as your skin is slick' cannot be determined from the given information. The doctor's response is not explicitly stated in the provided text. Therefore, it is not possible to determine if the doctor disagreed with, was unsure about, considered terrible, or agreed with the diagnosis.