Pregnant again

I had my daughter 10 months ago and I just found out I'm pregnant again. I have been fighting so hard with postpartum this whole time. I thought that maybe I would be happy but honestly I'm miserable. Everyday I feel like I fail as a mother and the thought of bringing another baby into this crazy life scares me. My daughter is my world and I would do anything for her. She's a happy and healthy baby but everyday I feel like I fail her.

My boyfriend said he'd be there for me but we just had a horrible fight and I am honestly wondering if we should even have this baby. We take care of our daughter to the absolute best of our ability but i feel like another baby would make everything worse.