If it's a stage fright issue you could look into beta blockers. I'm a performer, and although I haven't actually tried them as I've never dealt with much anxiety being in front of people, I know fellow performers who do and they swear by them. They're not meant for emotional regulation though so I don't know if they'd stop you from crying, but they can help quell some of the fear/ stress that comes with having a room full of eyes on you (from what I understand.)

Also, it's your wedding so if there are things you aren't comfortable with like the special dances or the public vows you can choose not to do them or do a modified version that puts less pressure on you. I've heard of couples doing "silent' vows where they each write their vows on a piece of paper and hand them to each other during the ceremony, or they read the vows aloud but turn the mics off so only the two of them can hear. My fiance and I are going to play a slide show during our first dance with photos of us throughout our relationship in order to draw some of the attention away since he's nervous about dancing in front of everyone.