Just looking for some support

My baby is week old and she was never able to latch, she has a tongue tie which made it super difficult for her and painful for me. We supplement with formula. When we got home from the hospital I started pumping and was producing a good amount. Now it seems if I go more than 3 hours without pumping my supply drops drastically. It's super hard to pump,feed my baby, change her and get her down and try to fit in some sleep. I think I'm going to go strictly formula fed. I feel like such a bad mom though! It's mentally exhausting and causing me so much anxiety and I've developed blisters on my nipples. I just don't know what to do anymore:(