Postpartum depression

Is anyone else struggling with this really bad? My first born daughter is 3 weeks and 2 days old and it’s hit hard. I don’t feel like my meds are working and I’m waiting on my new prescription because of an issue with my insurance and the doctor’s communication. I’m snappy to my baby’s dad (we broke up while I was pregnant), my baby’s crying frustrates me to the point where I get mad at her... I’m not very happy to be a mommy and I wanted and planned for this baby and it scares me. I feel like I’m terrible at motherhood, I’m having huge issues with breastfeeding so I have to pump and use formula, which is stressful and time consuming. I need someone to understand what I’m feeling, I just want to feel like myself again because I’ve never been this down in my entire life.