how do I stop

How do I stop thinking that if I don't have an eye on my baby every single second, that something's going to happen & she's going to die? I'm seriously going to lose my mind. I haven't been alone for a single day since I had her 11 days ago. My husband had to go back to work right away so my aunt & mom have been coming over to help making sure I eat & shower. Night time is really bad because then everyone is sleeping at the same time so how am I supposed to sleep peacefully for 2-3 hours between feedings? Is anyone else like this? I need a tiny bit of sleep & sanity. If you have any tips let me know! 😞😩