My sister is behaving weirdly these days.She is not coming out of the house and also not communicating with anyone properly.She does not eat nor sleep properly.She left job due to some issues and being at home.Suddenly she wakes up in the night and feels scared.She wont sleep that night.Some times she speaks about phylosophical things like the world is materialistic and all.For one moment she is full of positiveness and the next moment she feels so depressed we are unable to help her.She used to be very sharp and clever in everything she does but now she is doing nothing.She feels scared to go out to do job or to socialize with people.She wont even cry for any issues with her.She wont share anything that is happening to her.