How can I sleep, knowing my husband left

Ok, so this is my first time staying home alone with my son. cause my husband left out of town for work for 2 wks. As I'm laying in bed crying a bit cause I'm not used to sleeping in a house alone. I suffer from bad anxiety which my mind likes messing with me and I'm hearing all these random noises.. How can I sleep? just crying my eyes out in bed anything that can help, just to mention my son is sleeping with me cause I'm afraid of anything...