You have everything from Psychology/Psychiatry notes to overdose records that many health staff can pull up from almost any computer.
EDIT: Remember many jobs disqualify you from the job if you have any past psychiatric treatment. Even if you are in your 40s Psych drugs at 13 are a disqualifier. "Paying cash" is what some doctors have resorted to. http://www.idealmedicalcare.org/75-med-students-antidepressa...