I'm sorry you have to deal with that. I have been in a similar position in the past. We are in a better place now and sober - what came out of my partner at their worst is not reflective of their true feelings, it was reflective of the traumatic environment they were raised in.
I hope things get better for you.
Not really so far as I understand it. "Bipolar swings" are more commonly on a week-month timescale.