Experiences with anxiety

I am struggling badly with anxiety since my baby was born 4 weeks ago. I worry about her constantly. I worry about taking her places, bathing her, if her car seat is safe, how to dress her so she’s not too hot/cold, and literally everything in between. It gets worse at night cause I’m so extremely terrified by SIDs and get severe anxiety trying to figure out how to dress her for bed, making sure she doesn’t roll over in her bassinet or choke/stop breathing. I’m constantly toggling the temperature in our house bc I’m afraid she’s going to be too hot/cold. It feels like an elephant is sitting on my chest I’m so worried all the time. I called the doctor for a check-up but they can’t get me in for another 2 weeks so I’m just hoping someone has some advice for how to calm down or stop worrying so much. It’s been so hard to sleep and even function during the day cause I’m so worried about her.