Hi Snowangel!
Congrats on getting married! Don't panic, there's lots of options if you want to lose weight. But you have to be sure about why you want to lose the weight: is it because you would like to fit in The Dress, is it because YOU want to be healthy and stay it?
If you can make that clear to yourself at the start, you're halfway there.
One of the safest ways to diet I think is WW. They do not only give you a diet to follow, they also support you and give you tips as to nutrition and exercise etc. Maybe there is a center close to you (?). Also have a look on this site for other diet plans, but be careful, only a good (and healthy) diet (and some form of exercise) will do the trick, pills and creams and machines etc won't work.
Good luck and keep us posted,
Greekgirl