People online have been attempting to poke holes in the science of interstellar.
A primary care physician is usually the first medical practitioner contacted by a patient because of factors such as ease of communication, accessible location, familiarity, and increasingly issues of cost and managed care requirements.
This doctor will refer you to a specialist, probably a neurologist. Even if you medical coverage does not require this step, it's a good idea to see your primary care provider because there may be other parts of your medical history that he or she will recognize that make diagnosis easier and treatment faster.