Suze - contrary to the expectation that one's wedding is the most blissful day of her life, in reality it's brutal. I've been in several weddings, obviously including my own, and always there is much stress, frustration, sleep deprivation, hunger, meltdowns, and tears. Don't subscribe to the pressure to appear perfect right now.
And look, no matter what, you won't be drunk. That alone makes the day a huge success. Look where sobriety has gotten you. When we met, you were in such a sad place in your life. Today you are about to marry the man you love. Take a moment to look at the big picture and see how beautifully your life has grown and changed. That's what's truly important.
Don't try to live up to anyone else's expectations about your wedding. You will be beautiful, your husband will be enamoured with you, and your guests will be cared for. Perfect or not, everything will happen as it should.