I Am A Caregiver To My Spouse

I have been struggling a lot lately as I am getting so worn out. I find myself regretting that I promised my wife that I would stay with her until the end. Of course, I am not going to give up on her, I would never do that. But I am very burnt out lately and need a break, I just don't know how to get that break. She isn't too demanding, most times she is easy to care for. But it is also very frustrating at times as well. She qualifies for a lot of personal care but she doesn't want that, she only feels comfortable with me caring for her. I suppose I've been doing such a good job that I've made it so others are not good enough for her. At least that is what I keep telling myself to try to stay positive. It's been a struggle for me either way though and I know it is only going to keep getting worse.