If you have to ask if a relationship is bad, toxic, abusive or whatever...you already know the answer! Instead of looking for confirmation from others, accept your own assessment, and do what you need to do. Your mother does what she does because she can, and because you have set and enforced no boundaries.
You need to move out, then lay down the law to her, the way she used to do to you, and if she breaks those rules, you need to punish her the same ways she punished you.
If that doesn't work, start reflecting her crap back at her. Treat her the way treats you. Tell her she is screwed up in the head, how you wished she had used The Pill, etc. Go over in excruciating detail all the ways she is a bad mother, and all the ways she could of been a good mother, if she had bothered to try. Guilt trip her. Find her buttons, and push them with glee.