I understand what you're saying about your difficulties with the medical community. To me, the medical community as a whole really seems afraid of autism, perhaps because it is something they don't understand. One's best bet for a diagnosis would be with a neurologist or a psychologist specializing in children.
Dr. Leo Kanner first described the condition as "infantile autism," meaning that the condition, so characterized by a lack of interest in interacting with others, began at or before birth. He also listed some thirteen characteristics common among the group: an inability in relating to other people, an inability to assume proper posture for being picked up, an inability to use speech to convey thoughts, excellent rote memory, confusion over personal pronouns, an echoing of words and phrases, eating difficulties, extreme fear of sudden or loud noises, monotonously repetitive behavior, a fascination with objects, good intellectual potential, is physically normal otherwise, and often has highly intelligent parents.