Multiple behaviour. I don't understand.

My wife behaves in different ways. Sometimes she's ok and she'll do all household chores nicely but another moment she'll start behaving in different way. She'll start thinking that someone is in the room. Or someone has stolen her things. Or son/ daughter has done something.   She starts abusing blaming. And she'll defend herself by saying that you've only said this to me.  After that if she sleeps she'll sleep for a day or two.. she'll not wake up untill forced. And she'll forget what she has told. Sometimes she is someone else in the morning so caring and loving but next in the evening she's angry and abusing. Most of the day time she's alone at home. Our relationship as a husband wife is not so supportive. We often fight. Whom to consult I don't understand.