When do I quit being both a spouse & caregiver?

My wife is spin a bifida, and now, two years ago, have more than a few bulging disc. Now unable to work at the moment. Going back to school in fall.

Been married more than a few years. And she has always been 99% , dependent on me, the same when she lived her mom. And now with her 3rd pressure wound, I’ve had enough. She have never done what the docs have asked her.

There is a lot more, but comes down to her poor attitude, does what she wants how she wants. I spend more than 50% of my time taking care of her and 90% taking care of life. I feel I put in 150% into this relationship to her 1%. And I’m the one that picks up the slack, and feel more like
Caregiver vs husband, past few years, all I’m asked to do if she needs something, let alone touched or even talked to.

I’m about to give up on the marriage…