A doctor is the best person to see for non-urgent cases. Doctors can assess whether symptoms are caused by any other illness. They may then refer their patient on to a mental health practitioner trained in treating mental health conditions, or (if they have been trained themselves to know know a lot about mental illness) they can provide treatment at their clinic.
Other sources of help
In an emergency, where there is immediate danger or risk of harm to a person call Emergency Services on '000'
If you're worried about a family member or friend you can call Lifeline's 24-hour counselling service on 13 11 14