I am tired of my wife's health issues and the impact it has on our marriage and family. How can I handle this situation?

I am in a tough spot. My wife has diabetes and high blood pressure. I love her more than anything, but it really sucks and saddens me to see her do this to herself. I've always been motivated by other people working out and getting healthy, but it's the exact opposite with her. When I gained weight she did more work in the house, she's motivated. When I'm depressed she's very sweet and caring. She even got pregnant just to escape her mental health issues and now she's gained even more weight. I work double shifts and I've always thought I'm the one with the mental health issues, but it seems like she's the one. I've always tried to do the best for her and the family, and I still do. But I'm tired, very tired. I'm tired of buying her juices and smoothies and seeing her eat pizza and burgers and drinking soda. I'm tired of her not taking her medication and lying about it. I'm tired of her running away from confronting her image and constantly saying she's okay when she's not. I'm tired of her staying at home in bed and avoiding her life. I'm tired of our baby not having a healthy and happy mother. I'm tired of everything falling apart and I don't know how to handle it anymore.