Switched to formula

I switched to formula today. Breast-feeding this time around just wasn’t working for me. Especially with having a toddler. I found myself lashing out and being mean for no reason. I feel sad for both my babies. I think my stress wasn’t allowing me to produce enough breastmilk and it was also making me act rude with my toddler. My baby is only two weeks old and I’m so sad because my first child was exclusively breast-fed. I know fed is best but a part of my heart is hurting because I’m not able to provide food for this one the same way I did for my first. I could feel my mental health going down the drain and I’m only on day 14 of my newborn. I hope this allows me to feel a bit more human. I’m new to this whole formula thing is there any advice you could give me? Anything to make it go smooth? Thank you in advance