I was raised to be codependent by a mother who wanted her kids to be her servants. As the oldest child, I was affected most by her actions.

I suggest you try to make some time for yourself to give yourself some distance. Take some time for yourself - go see a movie, go see a friend, take a walk in nature to clear your mind. Perhaps you could seek some caretaker advice from elsewhere on this site. There is also a 12-step program called Co-Dependents Anonymous that holds meetings and posts information you might find helpful.