I feel horrible

I am a stay at home mom to a wonderful 3 year old little girl. I recently became a single mom about 4 months ago. I'm with her 24/7 without the help of her deadbeat father. I don't get to take a break. Now it feels like I'm her mother and father. I feel like a horrible mother for wanted a break from her and just a little space without having someone cry/scream in my face because something isn't going her way. I cry myself to sleep everytime. Her father doesn't care that I need a break. He is to busy with his new girl to see that I'm emotionally drained. My mom, sister in law and brother try and help me by being with her but whenever something doesn't go her way, there she is, in my face. I can't put her in daycare because that cost money that i don't have because I can't get a job. I don't have anyone to watch her so I can go to work. I can't depend on her father because he doesn't even get her when he is suppose to. I'm struggling to get everything done. I feel like I'm failing and losing myself at the same time. I don't know what to do.