HELP- I want to quit nursing.. please talk me out of it

My baby is 15 weeks and honestly I think what we’re going through now is harder than the newborn days. She has always been a tough baby.. but recently it has gotten so bad. At least when she was a newborn we were in survival mode and I hadn’t even had a glimpse yet at how much easier babies can be.. now she just cries all evening. She won’t comfort nurse. I feel like I’m the only one that can care for this baby yet I can’t even figure out how to comfort her. I wish someone else could help. I wish I could get more breaks without having to worry about pumping or what I drink or eat. Also, why is 3 months so hard? Why doesn’t it seem like I’m doing anything right?!😭