My son, age 23 has feelings: generally unhappy, very easily irritated, angry shouting, extreme nail biting. Need to get him to a doctor but would like to get him to a specialist - depending on what he has. Is it BiPolar, OCD, Anxiety? Where to start? He saw many as a child - was considered anxiety as a child, but none of the meds worked for the nail biting. He tried concerta, ridilin, prozac, has not taken anything since age 18.