How to calm nerves, my wedding is in one week, any advice?

I am so nervous and I have just started to admit to myself and my other half that I am starting to feel really stressed out. We react differently to stress. Initially I get more talkative and I like to explore all options and I go into detail (usually in the evenings, I'm such a night owl!) and he gets more quiet. He will make his point and say we will deal with it soon, then he doesn't want to discuss anything further. He does eventually get many things done, which I appreciate it and on top of that he works really hard. But I cant help my nerves, its only 1 week before the wedding and my outfit is still being altered for our reception and he needs his outfit too. I love him so much and he always tells me how much he loves me. We are both happy but are simply stressed out, there are still a few things left to do in addition to the outfits, like booking a limo, book hair and makeup person, get wedding band and finer details and not to mention looking after the guests. I'm so nervous...what can I do to stop talking so much when I'm nervous. I've been doing more exercise which helps for the entire day but by night time I'm fully awake and its like my heart starts pumping and I feel so nervous. I start thinking about what happens if we don't get this or that done. Help! Thanks in advance