I recently got married and the stress was insane!!! I made all the dresses (5 in total) myself and between my husband and our families we did everything even down to the bouquets and cake!!!
All I can say is try to calm down...the more you stress...the less you will remember and enjoy the day...it seems like it is all a blur to me now.
Do something that relaxes you...go for a walk on the beach/park. Do some window shopping with your bridesmaid/s. Listen to some music that you like and take the time to just breathe calmly for a few minutes each hour.
Eat healthy and drink water and what will be will be!!!
All the best for your big day!!! Enjoy yourself and have fun!!!