Bride 2 be in 4 weeks and I am stress eating...

I am getting married in 4 weeks and I have gained 5 pounds in 2 weeks. I am a big stress eater. I am getting my dress from alterations in 2 weeks and I am scared I won't fit in it and will only get worse. I need some help and motivation. Please any advice on how to stop this and on how to lose weight quickly. I was going to take a laxative and clean my system. Then start fresh.