Hi shadeinthesummer,
I have been through very similar conditions in my life..my mom takes it out in a similar way.i used to feel exhausted like you,i still do in some days.only i stay away from home and am exposed to this when i visit them or they visit me.
It feels like walking on eggshells,which is already exhausting; also it has some influence on almost everything i do.
For past few years, i remind myself everyday that no one deserves anger except themselves.
Here are what i tried, they help me temporarily for few days, till i leave my home.
Try to not listen to her spiteful words if any, whenever possible.. try to chant good words or gods name focussing on the meaningof what you chant.
Whenever you feel down because of her anger, tell yourselfthat she is like a child throwing a tantrum, you are not her aim of hurt. I understood that anger, hurtful words are the way my mother learnt to communicate her feelings with the world,because she was taught it that way by her parents and my father. I need not learn the same. Acknowledge that her anger is a language, not the very meaning/intention of her act.

Also, i found that my mother gets really irritable /angry when her blood glucose levels are low- she is a diabetic on treatment, she becomes very very spiteful when a meal gets delayed or she does not consume enough carbs for her anti diabetic medicines. So, me and my brother offer her(yes, we can only offer as it is difficult to talk to her when she is mad like that) something with sugar to maintain blood glucose levels. So if possible please get a physical check up to rule out any physical cause for this.
I would also suggest to remind her continously about practising forgiveness, and compassion till you notice a long lasting change.

Hope this helps.