Weight insecurities and dress not fitting

Hey ladies,so I only have about 2 weeks to try and lose 10 lbs which I seem to just be gaining weight at this point because of stress. Haha so much fun.... and my seamstress can bring out my dress a bit but don't want to spend the extra money but I think it's stressing me out more thinking about it all. I'm trying to enjoy this time and still eat healthy without worrying about my weight but it's hard.
If any of you have some tips of how to cope with stress,weight gain,dress fitting worries,or anything in the realm of self confidence issues I'd love to hear some advice to cheer me up❤ thank you.