my 5 month old is a diva

My 5 month old daughter is a diva. She has been formula/bottle fed during the day and nursed during the night for 3 months now and she still has days and now nights where she refuses to take her bottle from me. Every time I see if it's maybe the way i made it, like maybe i forgot a scoop of maybe i added too much or too little rice cereal or maybe it's too hot even tho she usually likes it very hot. No matter how I make it she won't take it. Screams, clawing at my chest, smacking the bottle away from me. I have tried baby food the last 3 times this has happened, which she usually loves, but on days like this she spits it all over me. All she wants is boob. And to make her happy again, I cave. How am I going to completely stop nursing by the end of march? I have to stop so I can get an accurate fitting of my wedding dress and so I won't have to worry about getting engorged or pumping or leaking during my wedding/honeymoon. Anyone else have a baby that fights eating a bottle??