My mom and I are constantly arguing and it's very emotionally draining. She always initiates the fights and then blames me. I used to get more upset and yell back, but recently I've been very cool and collected. I'm wondering if she has bipolar disorder or something along the lines of this because she gets depressed and then happy and then screams at me. Sometimes this all occurs in one day. How can I diagnose this and how can I try to talk to her about it?