I hate teling people what to do and hope I dont come accross like that, but i felt exactly the same, I would cry everytime I tried to feed her, I would lie awake at night worrying and in the end decided enough was enough I wasnt enjoying Chloe i was starting to resent her. I went out and stocked the cupboard with SMA. Now I love her to bits, shes happy I'm happy and we're both well. I wish I could have stuck with BF and regret I didnt try a bit longer, but at the end of the day, I feel that I am doing my very best for Chloe by bottle feeding, becase I enjoy being with her, I'm not stressed and constantly tired. I had had it drummed into me that BF was the best thing I could do for my baby and, actually, for me, it wasnt.
You must do what is right for you and your LO, not what people tell you is best for your LO.