My heart truly goes out to you and to all in this situation, an unpredictable living hell I can only imagine.
I have no experience of this personally but I do agree with all the posts so far. Look after you, you are only 22 you have a precious life ahead of you to live to the full. You can neither change or cure your Mother, she has made her choices.
You must make yours, look after you now, and if necessary detach to prevent further damage to YOU. Al Anon is great, so is the family and friends forum on here.
All the very best to you.