I also then get treated poorly because of it? I helped take care of my dad and lived with my parents. I did errands constantly asked if my sibling needed help. She'd basically do it then get mad at me for it. He passed away. My mom I live with. My sibling visits every couple weeks. I work PT. she doesn't. I do the errands also. But she feels "stretched". I'm dealing with depression and anxiety. Whenever she helps or does something she makes me feel guilty for it. How do I deal with this?
I hope you are being treated for the depression and anxiety. If you are not now participating in talk therapy and/or group sessions, I think that would be worth looking in to.
Medical conditions aside that require the care. Caregiving is a thankless job. Jeanne is correct, you need to do it for your mom without any sort of expectation of gratitude from anybody. Sis most likely will not change and the harder you try to get her to, the more stressed you will become trying to change her. You can only change yourself.
Have you found caregiver support groups? Talking to others in similar situations will help. If mom's care has become too much for you, perhaps it is time to move her to assisted living or whatever care is appropriate.