Postpartum depression

Hi ladies, just wanna know if any of you have been diagnosed with this and how it was treated? I recently had my baby about 3 weeks ago and i honestly adore her with all my life, but I find myself to be depressed most of the time. At times I feel like a failure or like I’m not a good enough mother but I’m really giving everything I have and it’s getting to me. I feel super overwhelmed at times and it just really sucks. Just wanna know everyone’s experiences with this, I have a hard time opening up but I know this is serious. I don’t wanna feel sad but I can’t not.