Letting go of your first born; help.

I am a momma to a 15 month old little boy, I stay at home with him & have only ever been away from him maybe 10 times for doctors appointments & one over night for my wedding, I am due with his brother in 8 short weeks, & I am having horrible anxiety about leaving him while I go to have his brother. & just horrible anxiety in general, I love all of mine & my husbands family & they are all wonderful with him, but I have this horrible fear of leaving him, that he’ll be scared or sad or will just miss mommy & daddy. & then I also feel horrible about leaving him just on a regular day to do something for myself, I haven’t had my hair done in a year lol 🤦🏼‍♀️ basically my question is what are some things you guys have done that have helped with the fear of leaving your babies & letting go of your first born a little? Because this momma can’t handle the thought of not having my baby 😩