i am a mental health nurses of 32 years. mental health crosses everything and there are so many areas you can go into, counselling, addictions, young people, elderly, forensics,prisons,
i even saw a job for a mental health nurses to work in a adult liver ward. you can progress onto doing health visiting and things like that. it rewarding, stressful an their is a massive shortage of mental health nurses.
if your ongoing, confident and have a interest in people and what makes them tick go for it. try the mental health sites /forums on face book