What is provided here is basic diagnostic information obtained from various sources. It is a very extensive list of symptoms and diagnoses. I am in no way a medical practitioner or have any medical experience aside from being a patient.
Self diagnosis can be harmful, along with self-medication.
If you think that you or someone you know may have a mental illness, then advice from a medical practitioner is the best person to obtain it from. The sooner the better too, in my opinion, and from my experience. I do have to admit a prejudice here, as I have have found this online book to be very informative and helpful.