You simply cannot be a psychologist or a psychiatrist if you have mental issues. Being a mentally deficient psychologist or psychiatrist is a paradox. You can't understand mental health if your brain doesn't work properly. Anybody who wants to become a mental health professional, must sign a legal document to self-certify own mental health. In XXI century this is still not happening. If you need help in mental health department, chances are that your doctor may be mentally impaired.