I may have been too quick to make my sister my MOH, but she's my only sibling and we've gotten close over the past several years (we didn't get along as kids). The further we get into wedding stuff, the more out of control she gets. She started by talking me out of buying the dress I fell in love with; she convinced me that it looked "cheap and tacky" (even though it was over $1,200, and my mother also loved it). She then tried to get me to buy the dress that she liked, which was way over my budget and I was actually allergic to the fabric. I broke out in giant neon-red blotches before I could even get the dress off. She tried to take my mother to buy the "mother of the bride" dress without me, and when I asked to be included, she snapped at me. She continued to be extremely demanding about every decision, insisting all my ideas were "dumb" and I had to go with all of her ideas and decisions. She was quickly becoming the bridezilla of MY wedding! If I tried to stand up for myself and say I wanted to go with my own ideas, she would completely fly off the handle and get nasty. At first I tried brushing it off as her just being the typical big sister, thinking she's always right. My parents thought she was dealing with some jealousy issues because she's 2 years older and not married yet.
Anyway, the whole thing really took a turn for the worse at our engagement party. Everything was going great, and then out of nowhere she started screaming at me, calling me a bunch of horrible names, and accusing me of being a terrible person. I kept asking her what I had done wrong and why she was so upset, because this was totally out of left field and I had no idea what was going on. She never explained herself, just kept screaming insults. She's always been a very dramatic person and has always needed to be the center of attention, so my FI actually expected her to do something like this, but I was still shocked and found it to be extremely hurtful. My parents pulled her aside and told her she was way out of line, but she never apologized. Weeks later, she still has not said a word to me, which leads me to believe she thinks she was right for doing that and spoiling the party for my FI and me.
The wedding is 10 months away so I'm sure this whole mess will blow over by then, but at this point I'm absolutely terrified that she will repeat something like that at our wedding! I do not want to be left sitting there crying and humiliated at my own wedding the way I was at my engagement party. My aunt (jokingly) suggested that I hire a bouncer to keep an eye on my sister and if she starts acting up, just have her removed. And I definitely think it may be a bad idea to let her make a speech. I seriously don't know what to do. Any suggestions? Has anyone else dealt with a sibling like this? I am absolutely shocked that she's behaving this way. What should I do if she starts getting dramatic and nasty at the wedding?