Anxiety sucks

I just want to be with my SO 24/7. I just went through 2 really bad situation within a month of each other. I get severe anxiety at night before I go to bed thinking he's going to leave for work in the morning and then I'm going to be left by myself. My anxiety of being alone is so bad I'm thinking about leaving my baby with a baby sitter just to go back to work just to be around people. This isn't me I love being a stay at home mom, I don't want somebody else enjoying daily task with my baby or seeing her first milestones. I want to be there for all the first things she achieves. But anxiety is at an ultimate level. I really hate feeling so dependent.