Day two of taking care of Isabelle with absolutely no help and I feel like a horrible mother because…

Day two of taking care of Isabelle with absolutely no help and I feel like a horrible mother because I am completely about to lose my shit. I am SO exhausted. She's been so fussy for the last few hours, and she's not pleased with anything, not even food. My depression is hitting a low point, so the sound of her screaming is just making it almost unbearable. Not to mention I get extremely anxious and paranoid being at home alone with her at night because I'm afraid someone will try and break in. I'm ready to curl up on the floor and die lol.