I'm sorry that you're having such a rough time :( Our LOs are close to the same age, and I've been struggling a little with the baby blues. I'm breastfeeding, but we've been struggling with it lately. That combined with the major adjustment of being a first time parent and general anxiety about transitioning to not working for the first time since I first got a job has made me a hot emotional mess.
Try to take it easy on yourself about the breast feeding. What's important is that your baby is getting the nourishment that it needs and that you are taking care of yourself.
Here's hoping these baby blues ease up soon, and that things start to ease up for you!