Single moms

How does anyone do anything? I have a colic baby, with horrible reflux, she's 6 weeks old and needs to constantly be held and even when I do hold her she's crying. I don't sleep, I can barely shower- never longer than five minutes. I can't eat, never mind try and sit and hold her. I have absolutely no help, I need to go back to work soon, but I'm currently a server, who doesn't make much, how are other single moms working? I'm literally dying over here. Not sure what to do, I see no light at the end of the tunnel and I'm starting to resent my life. My patience is stretched SOO thin