Meds not working

I’ve been on new depression meds for about 4 weeks now. They’re not working. Every day I feel worse even with my therapy appts. I cry every day and most of the time I don’t know why. I’m scared to take care of my baby alone because I’m afraid I’ll have a meltdown. My anxiety is so bad I’ll just cry and rock back and forth. I feel like PPD is slowing killing me. Nothing gives me joy. I have fleeting moments of happiness. I love my son more than life itself and at the same time I wish I never became a mom. I feel like a horrible person for even thinking that. I don’t know what to do. My husband is so supportive but doesn’t know how to help me. I don’t know how to help me.