Psychiatric. Or psychologist.

I am married for 9 years. Of late( from last 5-6 years) I am unable to understand my wife's behaviour, always tries to keep me on ledge and I am always afraid of me being doing some mistakes which may go wrong with her. She is extremely narcissistic and has almost cut herself from all of my family member. She will be in either of one state a) STATE A - Almost for 20 days she will be in grieving mood and tries to dent the marriage as much as she can. Always complaining and suspicious about almost all of my behaviour. Even not picking her phone makes her angry for a week. b) STATE B - For remaining 10 days she feels one of the best person in the world , all the suggestions appears very mature and sensible. I always believed that things can be sorted out by mutual understanding and talk, but when she is in STATE - A, she behaves very kiddish and denounce any good suggestion. I wanted to meet a doctor however I am not sure which doctor I should meet a psychiatrist or psychologist.