" Subconscious anorexia or potential medical issue?"
Not only is anorexia a subconscious issue, but it also poses over time, the potential for some very serious long term medical issues. Overall medical doctors are NOT going to be able to help with the subconscious or the mental issue. They'll be able to help with the physiological issues, that can come up. However the mental aspect will require the help of someone in the field of psychology, to help you work through that part.
The added information you gave, regarding the lighting of your period for some might be to much information. However it does definitely point to the developing of anorexia. The other symptoms only further help confirm you're developing anorexia. While Yahoo Answers is usually not the best place to start, some will care enough to answer and recommend as I am doing seeking help first in getting counseling, and second seeking help from a properly trained expert in the field of helping those with, or are developing anorexia.