Psychotherapy or Counselling

How do i know what i need? What is the difference between Counselling and Psychotherapy? In which case is the one or the other indicated?

Who is what

Psychologist, mental health counsellor, psychiatrist, psychotherapist, psychoanalyst. What is exactly each one of them and what are the differences between them?

Selection Criteria

Which criteria do i have to take in notice before i make my final decision?