Coping mechinisms - leaving isnt an option?

Hmmm, no friends you could stay with until you are on your feet? She sounds like a ticking time bomb. She needs to be on medication and if she is well then it isn't working and she should see a psychiatrist to re-evaluate. If you can't leave then I would try to avoid her when she is in these moods. Go to a room and read a book or something and try not to respond to her rages. Not the best thing I know, but you say you can't do the best thing right now.