I've got ya, girl! IT'S GONNA BE OKAY!!!!!!
I too, recently got back into the 160's (was in the 140's) am trying on wedding dresses in December and am freaking too.
BUT freaking won't burn calories! Take a deep breath. The worst thing we do to ourselves with weight is fail to forgive ourselves for gains. I used to hate the 210 lb version of myself. I was so mad I let that happen but one day, someone said "Let 210 Sarah go." I encourage you to let go of the self-loathing. How? Remember that only by looking FORWARD will this get any better.
January is still 2.5 months away. So, just drink your water, go back to whatever helped you lose before and remember that you KNOW you can do it, because you've already done it before!!!!!!!!!
I know weddings can add stress. I am the poster child for being nervous about that damn white piece of cloth. BUT I recently refound my strength in the past two weeks and I know you can find yours again. I am here for you, as are many others.
You've got this, girl. You're a freakin' powerhouse, so act like it