I feel like I'm failing my kids 💔

Recently I separated from my husband, we are trying to slowly work things out, I moved to live in a trailer at my parents house with my kids during this process. I put my kids in a new school, and started a new job. It's mainly me that does all their care since he is only around on weekends. I feel like I'm always tired and grouchy, I feel like I'm failing as a mother. I feel more distant from my kids than I've ever been before and it hurts because this is always something that was so important to me. I try to do something fun on weekends when I'm off and they're out of school but a week ago my husband was injured and had to have surgery, so even more responsibility landed on my shoulders. It feels like I'm constantly having to hand them off to their grandparents so I can take him to an appointment or me going to work. I'm not sure what the point of this post is other than to just get some of this off my chest.